A man has been charged after allegedly stabbing a man in the neck and injuring another as they dined at a Chinese restaurant on the NSW Central Coast.

The pair attempted to stop a man who was allegedly trying to rob the Long Jetty Chinese Restaurant in Long Jetty last night.

The 30 year-old man wore a balaclava and held a knife as he allegedly threatened a 13-year-old girl working behind the counter about 6.30pm yesterday.

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Two diners who eat at the restaurant every Saturday night, both aged 55, fought back and stopped the attempted robbery in its tracks.

They received help from chef Lian Hwong-Pa, who hit the man over the head and helped hold him down until police arrived.

"The man is so powerful, so strong, so I grabbed the empty bottle there, so I hit his head," he said.

He recalled seeing the girl being very scared when she was approached by the man.

"The young girl, so scary!" he said.

"Saw the knife, the guy said, 'give me your money!'"

One of the diners was stabbed in the neck and the other one suffered lacerations to his hand.

UPDATE: Man allegedly wearing tactical gear, carrying rifle shot dead by police

The man with stab wounds to the neck was airlifted to Royal North Shore Hospital in Sydney in a stable condition, while the other man was taken to Gosford Hospital for treatment.

Superintendent Chad Gillies was scathing when discussing the man who allegedly targeted the restaurant.

"It's absolutely cowardly," he said.

"When you're [allegedly] threatening a 13-year-old shop attendant, it's completely unacceptable."

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The 30-year-old man was arrested at the scene and taken to Wyong police Station, where he was charged with two counts of aggravated assault with intent to rob, as well as wounding and grievous bodily harm charges.

He faced court today, where bail was refused.

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A man shot dead by police on Brisbane's outskirts during a domestic violence incident was wearing camouflage tactical gear and carrying a long-arm rifle, according to the police union.

The 48-year-old man allegedly confronted police who arrived at a house on Cavill Place in Narangba about 12.30am after reports of a domestic disturbance.

It was reported the man had been making threats, and Queensland Police Union's general president Shane Prior said the situation escalated rapidly.

UPDATE: Man killed in shark attack in Far North Queensland

"When police arrived, they saw a man known to police come to the front door … dressed in camouflage, armed with what appeared to be a rifle," he told media.

"That man directly threatened police with that rifle. They chose to use lethal force, both using their service-issued firearm, each firing a number of rounds."

Prior added the man was wearing a tactical vest and had "some sort of army background".

Neighbours said they heard shouting and police urging the man to drop his weapon multiple times, before hearing gunshots.

"They asked him about five times to drop the gun," one neighbour said.

"We heard four gunshots and a pause, and then another gunshot," another said.

Officers provided first aid and CPR, and paramedics arrived soon after, but the man died at the scene.

There was a woman, an 18-year-old and a teenager in the home at the time, all of whom were related to the man.

They were taken to hospital for emotional distress.

Prior said initial investigations suggested there may have been mental health issues at play.

"Tragically, suicide by cop is a very real thing that needs to be investigated here," he said.

Prior added the union was fully supporting the police officers involved, both of whom were impacted by the shooting.

"Both officers are very shaken up by today's incidents, one more than the other," he said.

"This is a very traumatic event."

Acting Superintendent Kerry Johnson confirmed there were other people in the house at the time of the shooting, and that the man who died was subject to some form of order, though he refused to confirm if it was a specific domestic violence order.

"When police arrived, he was originally inside. [They] were making their inquiries at the front door, this other interaction with a family member, and that's when he's confronted police," Johnson said.

"It's happened very quickly, and unfortunately these are the things that happen in policing, it can escalate and de-escalate."

Nobody else was injured and police say there is no ongoing risk to the community.

As the shooting is classed as a death in custody, it is now a coronial matter. Ethical standards command is also investigating the shooting.

Johnson said he could not make a full judgment on the validity of the police officers' actions this early in the investigation, but he believes at this early stage, there is no cause for concern.

"It's up to the officers at the time to determine what they're going to do… unfortunately, the 48-year-old with his confrontation and behaviour, unfortunately [forced] them to escalate and the action was taken," he said.

"It's alarming to do what we have done, but there's nothing at this stage to cause concern about the police actions."

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A 29-year-old man has been charged after allegedly pointing a gun at people waiting for a train in Sydney.

Mohamad Zreika allegedly pointed a pistol at commuters waiting at Lidcombe railway station, before boarding a train to Bankstown at 5.30pm yesterday.

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He was arrested at Bankstown and police found a replica pistol, which they took for forensic examination. He was charged with affray and possessing an unauthorised pistol.

He was taken to hospital for a mental health assessment.

He was refused bail to appear before Bail Division Local Court 7 today.

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The crash happened near Tekapo Canal Rd, south of the Tekapo-Pūkaki Canal Bridge.

A man has died after a shark attack off the coast of Far North Queensland.

Emergency services were called to Hull Heads Beach, around 160 kilometres south of Cairns, about 12pm after reports a man had been bitten by a shark in the surf around Kennedy Shoal.

The man, 39 was taken ashore on the Hull River Boat Ramp, where he was treated by paramedics.

UPDATE: Man allegedly wearing tactical gear, carrying rifle shot dead by police

However, Queensland Police later confirmed he had died of his injuries.

The attack happened on the Cassowary Coast, sandwiched between Cairns and Townsville in the state's north.

Hull Heads in just south of popular tourist spot Mission Beach.

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Close to the Great Barrier Reef, the area is popular for those wanting to go snorkelling and scuba diving, and also has several tropical islands for tourists to explore.

The death is the third from a shark attack in Australia this year.

In January, a 12-year-old Sydney boy Nico Antic died after an attack by a suspected bull shark near Shark Bay in Vaucluse.

Last week, a 38-year-old spearfisher Steve Mattabonni was killed off Rottnest Island in Western Australia after being attacked by a great white shark.

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Sydney saw a spate of shark attacks earlier in the year as wet weather created brackish water near beaches and rivers across the city, which are ideal conditions for bull sharks.

Similar conditions hit the city this weekend, with residents urged to stay out of the water.

A report on the Queensland man's death will be prepared for the coroner.

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Thian Britten told the woman he assaulted to “go in and say that you lied”.

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The State Highway 1 and Horahora Road intersection is currently blocked.

A Mazda had to be towed from a beach after an allegedly drunk driver crashed through a guard rail, careered down an embankment and ended up on the sand.

The 32-year-old woman, who police say was allegedly double the legal limit had a lucky escape as the wooden rail went through the windscreen at Aldinga Beach, south of Adelaide.

Images show the post completely speared through the windscreen.

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She wasn't hurt but was reported for drink driving and driving without care and banned from driving for six months.

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Police say the man left the force two years ago.