Several passengers wrestled the man to the floor, Ashton said. The crew gave them seat belts to hog-tie him before the plane made an emergency landing at Melbourne airport.

Armed officers from an elite police unit boarded the flight, handcuffing the man and escorting him off. Photographs taken by a passenger a showed black-clad officers carrying rifles in the cabin.

The suspect, who lived in the Melbourne suburb of Dandenong and was studying to be a chef, said he was carrying a bomb but the device was actually a Bluetooth speaker slightly larger than an iPhone, Ashton said.

Prime Minister Malcolm Turnbull said the incident was “not currently being treated as terrorism-related”.

“I’m informed the man has a criminal history and has previously been treated for mental health issues,” he said.

The unnamed man was charged with making threats and false claims, and endangering an aircraft’s safety - offences that carry a 10-year sentence. He was due to appear in Melbourne Magistrates Court later Thursday.

Malaysian Deputy Transport Minister Abdul Aziz Kaprawi earlier said the incident was “not a hijack” but involved “one disruptive passenger (who) tried to enter the plane’s cockpit”.

While officials played down the incident, passengers spoke of a terrifying 90-minute ordeal after the plane took off.

A business class passenger, former Australian Rules football player Andrew Leoncelli, spoke to Melbourne radio station 3AW.

“The staff were saying ‘Sit back down sir, sit back down sir’. He goes ‘No, I’m not going to sit back down, I’m going to blow the plane up’,” Leoncelli said.

“The staff screamed out ‘I need some help, I need some help’. So I jumped up, undid my buckle, and approached him.”

Leoncelli said the man ran to the back of the plane, where two other passengers grabbed him, removed the device, and “put hog ties on him”.

Passenger Arif Chaudery said he joined several others to subdue the Sri Lankan.

“Families, kids, they were very scared, and some screaming... so three or four guys, we jumped as quickly as possible,” he told Channel Nine television.

“We just put him on the floor and finally staff brought the belt, so we handcuffed him and tied his legs and put his face on the floor.”

A passenger who gave her name as Laura told the Australian Broadcasting Corporation she feared for her life.

“I thought the plane was going to go down, I thought the bomb was going to go off, I really did think I was going to die,” she said.

Some passengers questioned why it took so long for the elite unit to arrive after the plane landed, complaining they had to wait an hour.

But Ashton said there was no delay for such a “life or death scenario” and that officers had to sift through reports of more than one alleged attacker and confirm if the device was explosive before they could safely remove passengers.

Victorian Premier Daniel Andrews said Thursday that passengers and crew were being offered support after the “frightening” experience.

The incident came just months after Canberra called off the search for missing Malaysian Airlines flight MH370 after a vast underwater hunt off Australia’s west coast failed to find the plane.

MH370, carrying 239 passengers and crew, disappeared in March 2014, while another passenger jet, MH17, was shot down in July of the same year while flying over Ukraine, in twin tragedies to hit Malaysia’s national carrier.