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Opening the exit automatically deployed a slide from the back of the wing at the fuselage to the ground, a Jetstar statement said. But the man instead walked along the wing and climbed down one of the Airbus A320’s two engines, an official said.

Passenger Audrey Varghese said passengers screamed and shrieked as the man began “erratic� behavior shortly before he opened the hatch.

“The man was exhibiting some quite strange behavior,� Varghese told Melbourne Radio 3AW.

"As soon as the plane had started coming to a stop, he immediately got up and basically charged to where the emergency exit row is, and in the process shoving people, causing a bit of commotion, (and) ripped open the emergency door,“ Varghese said.

Another passenger, identified as Maddison, told Nine News television the man had been vaping, which is not allowed, during the 90-minute mid-morning flight and had unsuccessfully demanded the air crew provide him with alcohol.

Australian Federal Police officers had been alerted by Jetstar staff and arrested the man for “alleged aggressive behavior and breaching aircraft safety protocols,� a police statement said.

He was assessed by paramedics and taken to a hospital, where he remains for further assessment, the police statement said.

Police were continuing to investigate and charges were likely to be laid at a later date, they said.

Melbourne Airport said the man was detained by aircrew and ground staff before police arrested him.

Social media images showed at least three ground staff restraining the man on the tarmac.

“Melbourne Airport is proud of the exceptional response from ground crew, which meant there was no immediate danger to other passengers or airport staff,� an airport statement said.

Varghese spoke from the baggage collection area of the airport an hour after the landing and said passengers had been told the deployed slide had delayed the unloading of their luggage. Nine News reported the baggage was released hours later.