She died today.

Three teenagers have been charged after they allegedly stole a Melbourne woman's car while armed with a machete.

The woman was in her car when she was allegedly approached by the three teenagers at Williams Landing around 3pm on Thursday.

Police allege the teenagers threatened the woman, forced her to leave the car and drove away in it.

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In an interview with 3AW, the woman alleged one of the teenagers threatened to kill her

The woman was not physically injured and reported the incident to police.

The three teenagers were arrested in Taylors Lake several hours later.

The woman's Lexus SUV was returned to her.

Several of the woman's neighbours told 9News they were horrified over the incident.

Two 15-year-olds and a 17-year-old were charged with aggravated carjacking.

All three will appear in children's court at a later date.

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A major refuelling issue at Perth Airport that caused the cancellation of at least 59 international and domestic flights has been resolved, an airport spokesperson has confirmed.

The airport is now working with airlines to clear a backlog of flights after thousands of passengers were suddenly stranded this morning.

The delays were caused by an outage due to "low pressure" in the fuel systems, the airport spokesperson said.

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"Perth Airport has worked with external experts to resolve the issue," the spokesperson said.

"We will continue to monitor the situation closely in the event of any further issues".

The issue meant that aircraft arriving at the airport were unable to be refuelled or depart from the Western Australian city.

"We again thank both passengers and our airline partners for their patience and understanding," the spokesperson said.

Earlier the airport acknowledged that it had been a difficult and frustrating morning for passengers.

Passengers are being told to contact their airlines for information about their flights.

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Earlier a spokesperson said airlines had been advised not to send aircraft to Perth Airport until further notice unless they had sufficient fuel to make a return flight.

9News confirmed hundreds of travellers had been affected, many of whom have said they wanted to be compensated because the ordeal has cost them thousands of dollars.

Perth Airport's online departure board showed the first flight to be affected was a Singapore Airlines flight to Singapore had been due to depart at 1.10am.

It comes after Perth Airport announced a $5 billion deal with Qantas to upgrade the airport with a new terminal and runway yesterday.

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Marian Shields Robinson, the mother of former US First Lady Michelle Obama who moved with the first family to the White House when son-in-law Barack Obama was elected president, has died. She was 86.

Robinson's death was announced by Michelle Obama and other family members in a statement that said "there was and will be only one Marian Robinson. In our sadness, we are lifted up by the extraordinary gift of her life."

She was a widow and lifelong Chicago resident when she moved to the executive mansion in 2009 to help care for granddaughters Malia and Sasha. In her early 70s, Mrs. Robinson initially resisted the idea of starting over in Washington, and Michelle Obama had to enlist her brother, Craig, to help persuade their mother to move.

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"There were many good and valid reasons that Michelle raised with me, not the least of which was the opportunity to continue spending time with my granddaughters, Malia and Sasha, and to assist in giving them a sense of normalcy that is a priority for both of their parents, as has been from the time Barack began his political career," Robinson wrote in the foreword to A Game of Character, a memoir by her son, formerly the head men's basketball coach at Oregon State University.

"My feeling, however, was that I could visit periodically without actually moving in and still be there for the girls," she said.

Robinson wrote that her son understood why she wanted to stay in Chicago but still used a line of reasoning on her that she often used on him and his sister. He asked her to see the move as a chance to grow and try something new. As a compromise, she agreed to move, at least temporarily.

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Granddaughters Malia and Sasha were just 10 and seven, respectively, when the White House became home in 2009. In Chicago, Robinson had become almost a surrogate parent to the girls during the 2008 presidential campaign. She retired from her job as a bank secretary to help shuttle them around.

At the White House, Robinson provided a reassuring presence for the girls as their parents settled into their new roles, and her lack of Secret Service protection made it possible for her to accompany them to and from school daily without fanfare.

"I would not be who I am today without the steady hand and unconditional love of my mother, Marian Shields Robinson," Michelle Obama wrote in her 2018 memoir, Becoming.

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"She has always been my rock, allowing me the freedom to be who I am, while never allowing my feet to get too far off the ground. Her boundless love for my girls, and her willingness to put our needs before her own, gave me the comfort and confidence to venture out into the world knowing they were safe and cherished at home."

Robinson gave a few media interviews but never to White House press. Aides guarded her privacy, and, as result, she enjoyed a level of anonymity openly envied by the president and first lady.

It allowed her to come and go from the White House as often as she pleased on shopping runs around town, to the president's box at the Kennedy Center and for trips to Las Vegas or to visit her other grandchildren in Portland, Oregon.

She attended some White House events, including concerts, the annual Easter Egg Roll and National Christmas Tree lighting, and some state dinners.

White House residency also opened up the world to Robinson, who had been a widow for nearly 20 years when she moved to a room on the third floor of the White House, one floor above the first family. She had never traveled outside the US until she moved to Washington.

Her first flight out of the country was aboard Air Force One in 2009 when the Obamas visited France. She joined the Obamas on a trip to Russia, Italy and Ghana later that year, during which she got to meet Pope Benedict, tour Rome's ancient Colosseum and view a former slave-holding compound on the African coast.

She also accompanied her daughter and granddaughters on two overseas trips without the president: to South Africa and Botswana in 2011, and China in 2014.

Craig Robinson wrote in the memoir that he and his parents doubted whether his sister's relationship with Barack Obama would last, though Fraser Robinson III and his wife thought the young lawyer was a worthy suitor for their daughter, also a lawyer. Without explanation, Craig Robinson said his mother gave the relationship six months.

Barack and Michelle Obama were married on October 3, 1992.

One of seven children, Marian Lois Shields Robinson was born in Chicago on July 30, 1937. She attended two years of teaching college, married in 1960 and, as a stay-at-home mother, stressed the importance of education to her children. Both were educated at Ivy League schools, each with a bachelor's degree from Princeton. Michelle Obama also has a law degree from Harvard.

Fraser Robinson was a pump operator for the Chicago Water Department who had multiple sclerosis. He died in 1991.

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Mexico's drug cartels and gangs appear to be playing a wider role than before in Sunday's elections that will determine the presidency, nine governorships and about 19,000 mayorships and other local posts.

The country's powerful drug cartels have long staged targeted assassinations of mayoral and other local candidates who threaten their control. Gangs in Mexico depend on controlling local police chiefs, and taking a share of municipal budgets; national politics appear to interest them less.

But in the runup to Sunday's vote, gangs have increasingly taken to spraying whole campaign rallies with gunfire, burning ballots or preventing the setting up of polling stations, and even putting up banners seeking to influence voters.

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Security analyst David Saucedo says it's likely some drug gangs will try to force voters to cast ballots for their favoured candidates.

"It it is reasonable to assume that the cartels will mobilise their support bases during Sunday's elections," Saucedo said.

"They have loyal voters who they have won over through the distribution of food packages, cash, medicine and infrastructure projects. They will use them to support narco-candidates."

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In some places, it appears the gangs are encouraging people to vote while discouraging voting in areas controlled by their rivals.

On Friday, electoral authorities reported that assailants burned a house where ballots were being stored ahead of Sunday in the violence-wracked town of Chicomuselo, in the southern state of Chiapas. While they did not say who was behind the attack, the town is completely dominated by two warring drug cartels, Jalisco and Sinaloa.

On May 14, gunmen apparently linked to a cartel shot and killed 11 people in a single day in Chicomuselo. On May 17, five people were killed along with a mayoral candidate when gunmen opened fire on a crowd in the town of La Concordia, Chiapas, about 75km east of Chicomuselo.

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Targeted assassinations of local candidates continued. On Wednesday, dramatic video images showed a mayoral candidate in the southern state of Guerrero being shot in the head at point-blank rage with a pistol. A total of 31 candidates, almost all running for mayorships, have been killed this year.

But mass attacks on campaign rallies, once exceedingly rare in Mexico, are becoming common, and have killed many more supporters than candidates this year. The effect is intimidating.

On Wednesday, the last official day of campaigning, unidentified gunmen opened fire a couple of blocks away from a mayoral candidate's final campaign rally in the western state of Michoacan, sending hundreds of people scrambling for safety.

"It seemed like a normal evening, like the campaign closers of other candidates," said Angélica Chávez, a homemaker who was at the rally in Cotija. "Then there were gunshots, several rounds of gunfire very close. And then people started running and diving to the ground, crouching."

Chávez was hurt in the stampede and had to take refuge in a local church.

In Celaya, a city in Guanajuato, gunmen opened fire on a campaign event in April, killing a mayoral candidate and wounding three of her supporters.

Saucedo, the analyst, sees the shootings as a sign that narco gangs are no longer willing to see their handpicked candidates lose.

"Rather than allow the victory of a candidate who is not in line with their criminal interests, or allow a candidate linked to a rival drug gang to win, they use this tactic," Saucedo said. "What we're seeing in the final stretch is pretty desperate strategy on the part of some groups of drug traffickers."

Saucedo said that such attempts at narco-control of local politics had been seen previously in some particularly violent states, like Tamaulipas. "What was once limited … is now spreading to include the whole country," he said.

The National Electoral Institute says it has had to cancel plans for 170 polling places, mostly in Chiapas and Michoacan and mostly because of security problems. In Chiapas, electoral authorities say there are places they can't even go to. While that's a tiny fraction of the country's 170,858 polling places, it's disturbing.

And in the northern border city of Nuevo Laredo, a shadowy group that local media reports link to the dominant Northeast drug cartel has put up posters claiming one mayoral candidate is linked to the rival Gulf drug cartel.

Authorities have not confirmed the origin of the crude poster, which includes a photoshopped image of the candidate waving an assault rifle and wearing a bulletproof vest with the Gulf cartel's insignia.

In the state of Morelos, just south of Mexico City, residents awoke this week to find a banner strung over a road claiming a gubernatorial candidate was tied to rival drug gangs. The banner was signed by a local drug boss whose name is unknown, "the Commander of the Three Letters."

Another apparently gang-related banner threatened that anyone trying to buy votes would be "punished severely." That banner was signed by "Those who have always called the shots here."

Such events appear to indicate that past calculations by the cartels — take out the strongest candidate you don't like, and the remaining major-party candidate will win by default — have become more complicated.

In one town in Michoacan, Maravatio, the gangs apparently tried to eliminate any doubts as to who will win this year; they killed off three candidates for town mayor who were apparently not to their liking.

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