The Malaysia Airlines flight MH128 from Melbourne to Kuala Lumpur returned to Australia when the “disruptive” passenger stormed the cockpit, the airliner confirmed.
Local reports say 11 passengers tackled a man holding a device after he claimed he had a bomb.
The plane was forced to land and requested security assistance.
Images circulating on social media show armed police on board the airliner.
Flight tracking website FlightRadar24 shows the plane was airborne for just 14 minutes after it took off at at 11.27 (local time.)
A Malaysia Airlines spokesman said: “MH128 departed Melbourne Airport at 11.11pm and was to arrive Kuala Lumpur at 5.28am on June 1 made a turn back to Melbourne after the operating captain was alerted by a cabin crew of a passenger attempting to enter the cockpit.
“MH128 safely landed in Melbourne Airport at 11.41pm. The aircraft is currently on the remote bay and waiting for security assistance to arrive at the aircraft.”
Other reports suggest the man was holding an “electronic frequency” instead of explosives.
Officials have closed off a large area of the airport and emergency crews met the plane as it landed safely.
The passenger was apprehended by airport security on arrival.
A spokesman added: “Following the incident on MH128, the disruptive passenger has been apprehended by airport security. Malaysia Airlines, together with the Australian authorities, will be investigating the incident.
“Safety and security are of the utmost priority to Malaysia Airlines. The airline wishes to apologise for the inconvenience caused.
“Passengers have safely disembarked the aircraft and will be screened by Australian authorities.
“Affected passengers will be accommodated at hotels and will be offered a seat on the next available flight or on other carriers.”
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