The flight had only left the airport a few minutes before the incident with the passenger began.
The passenger from economy class jumped up just after take-off and claimed he had a bomb.
The statement gave no other details of the incident.
A statement from the airline said it turned back due to a "disruptive passenger".
Passengers worked with the flight crew to subdue the man.
The Malaysia Airlines flight has since landed safely and the passenger has been apprehended by airport security. According to reports, passengers tackled the man as he attempted to enter the cockpit.
Passengers who were onboard MH128 however are still in Melbourne Airport with their bags still on the flight.
All other flights were diverted to Avalon, near Geelong, with Melbourne Airport in lockdown at the time. Malaysia's deputy transport minister, Abdul Aziz bin Kaprawi, told AFP the item was not a bomb, but a "powerbank".
About three minutes later the same male voice can be heard saying the passenger was "claiming to have an explosive device, tried to enter the cockpit, has been overpowered by passengers".
Heavily armed police boarded the plane after it returned to Melbourne. The flight was around seven hours away from Kuala Lumpur.
The incident is the latest involving the Malaysian airline that is still missing MH370 that disappeared in 2014 and had MH17 shot down in Europe a year later.
The passenger was later arrested by Australian authorities in Melboure. "At the moment, the airline does not wish to make any premature conclusions until a full investigation has been concluded".
Passengers were screened upon disembarkation and put up at hotels, and will be offered seats on alternative flights.
The 18th seed, fired a total of 20 aces, including six in the first set alone, which he raced through in 30 minutes on Tuesday. Konta, 26, is yet to win a match in the main draw at Roland Garros after three successive first-round losses.
There were other complications with the one-page special session agreement hurriedly drafted Monday among the state's top leaders. On Wednesday, the House approved bills for taxes, education and transportation, with senators doing the same with taxes.
The wall is in the Old City, a part of east Jerusalem , which the US and most of the world consider to be occupied territory. Trump said as a candidate he would move the embassy to Jerusalem , but now says he's studying the issue.
A game of football or a concert is a moment that you must live with passion and enthusiasm. "I just want to enjoy my football". He can think what he wants. "For this reason, I hope to see a great game and all my players trying to win for us", Conte said.
Greater Manchester police said after this morning's raids that they were "keeping an open mind" in a "fast-moving investigation". The Conservatives and Labour are to resume local general election campaigning on Thursday, and national campaigning on Friday.
One of the few times Gustafsson didn't just evade Teixeira's lunge was in the third round, when he almost finished the fight. He went into the fifth round against Glover Teixeira on Sunday but didn't require the judges.
Short is Exeter's top try-scorer this season, scoring 11 tries in the Premiership and going over 14 times in all competitions. The game also marked England worldwide Danny Cipriani's return to Wasps after he rejoined from Sale Sharks over the summer.
Apparently, Shah Rukh Khan will be seen in a cameo as a magician, who helps Salman's character discover his talents. The film is directed by Kabir Khan and also stars Chinese star Zhu Zhu , Zeeshan Ayyub and late actor Om Puri .
The move is an abrupt shift from past instructions that have mostly told civilians to stay in place until the fighting is over. The enclave covers mainly the Old City centre and three adjacent districts alongside the western bank of the Tigris river.
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In light of that need for roster enhancement, this could have been the last parquet party for a fair number of those in uniform. The deficit reached a peak of 37 points, the second worst under Brad Stevens to the 50-point lead the Cavs reached in Game 2.
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