Homicide Squad detectives are investigating after a man was found dead on a suburban street in Melbourne's east early this morning.

The man, who is yet to be formally identified, was located on the road, near a white Holden sedan on Tidcombe Crescent in Doncaster East, just before 5am.

The car had significant damage to its bonnet and driver's side.

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A number of residents have told 9News they heard a loud bang late last night.

"Around 11:30 or maybe 11:45ish I heard a huge thump," one resident said.

"I'm not too sure what it was. A little bit of screaming and stuff."

An area of the street has been cornered off as detectives piece together what happened.

"The exact circumstances surrounding the incident are yet to be established and the investigation remains ongoing," police said.

Three teenagers have been charged after four cars were allegedly stolen from the same home, with one later crashing into a concrete wall in Sydney's north-west.

The teenagers allegedly stole two Mercedes, a Kia and a Volvo from a home in Kellyville about 2am on last Thursday.

Just 15 minutes later, a Mercedes AMG allegedly crossed multiple lanes of traffic before smashing through a reinforced concrete wall on Windsor Road near Barina Downs Road in Norwest.

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Police said they attended the scene after the crash but no one was in the Mercedes, which was severely damaged.

Officers executed two separate search warrants at properties in Constitution Hill on Sunday.

"At a property on May Street, police arrested two teenage boys, both aged 16, who were taken to Merrylands Police Station," police said.

"During the search, police located and seized car keys and mobile phones."

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During a second search at another Constitution Hill home on Killylea Way, a 15-year-old boy was arrested.

The three boys were charged with a total of 21 offences including aggravated break and enter, car theft charges and participating in a criminal group.

All of the boys have been granted conditional bail and will face the Children's Court this month.

‘I know where you live, I’ll come for you,’ he threatened if the victim went to police.

An exclusion zone is in place in a coastal Queensland suburb as police negotiate with a man.

The Public Safety Preservation Act (PSPA) was put in place just after 3:20pm in an area of Clinton, Gladstone bordered by Aerodrome Road and Pashley Street.

Queensland Police first went to a house inside the exclusion zone about 11.40am, and specialist officers are continuing to negotiate with a man hours later.

The public should avoid the area, police have advised.

Those within the exclusion zone have been asked to stay inside until further notice.

Qantas has issued an apology to customers amid allegations they continued to advertise tickets for thousands of cancelled flights last year.

The Australian Competition and Consumer Commission (ACCC) last week took the airline to court, alleging it sold online tickets for more than 8000 flights scheduled to leave between May and July last year, even after it had cancelled them.

In a lengthy statement issued today, Qantas said it would review the allegations made by the ACCC and have more to say once it had the opportunity.

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The consumer watchdog also claimed Qantas failed to inform ticket holders about the cancellation of more than 10,000 flights during the same period.

"These allegations have caused significant concern among our customers, our people and the general community," Qantas said in a statement.

"We want to address those allegations as best we can without cutting across the legal process we are now involved in, which follows an ACCC investigation with which we fully co-operated."

The ACCC brought the Federal Court action after an extensive investigation.

Qantas cancelled almost one in four flights between May and July last year, and scrapped about 15,000 out of 66,000 domestic and international flights in its schedule, ACCC investigators claim.

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"The period of time that the ACCC's claims relate to, in mid-2022, was one of well-publicised upheaval and uncertainty across the aviation industry, as Qantas struggled to restart post-COVID," Qantas said in its statement.

"We openly acknowledge that our service standards fell well short and we sincerely apologise.

"We have worked hard to fix them since and that work continues.

"The ACCC's allegations come at a time when Qantas' reputation has already been hit hard on several fronts.

"We want the community to know that we hear and understand their disappointment.

"We know that the only way to fix it is by delivering consistently.

"We know it will take time to repair. And we are absolutely determined to do that."

Qantas last week confirmed it would scrap the expiry date on $370 million of unredeemed Qantas credits for flights that were cancelled or changed during COVID-19.

The move was made after Qantas chief executive Alan Joyce said the company would claim the money if it wasn't used by the end of the year.

Alan Reay’s lawyer says “no need for accountability”, “no public interest” in pursuing it.

All attempts to contact the tech giant to solve the issue have fallen on deaf ears.

It depends who you ask.

P&O’s customer service department told passengers they didn’t need Australian visas.

Shannon Avery was one of three who held the group at the house for several hours.