A BACKPACK has been blown up after a passenger heard another traveller talking about a bomb while on an easyJet flight destined for the UK.

A passenger reportedly heard someone speaking about a "bomb" on the U23246 flight from Ljubljana, Slovenia to the Stansted airport in London with the flight making an emergency landing at Cologne airport overnight, airlive said.

2 The plane made an emergency landing at Cologne-Bonn airport (stock image) Credit: Reuters

Three male passengers have since been detained by police.

Federal police were called in, Bild has confirmed, with authorities rushing onto the aircraft once the 151 passengers had been evacuated on Saturday afternoon.

A backpack was reportedly blown up outside the aircraft.

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A spokesman for the police in Cologne told BILD: "We take the situation very seriously, but can not confirm that there was a concrete terror suspicion."

An easyJet spokesperson told The Sun Online: "easyJet can confirm that flight EZY3246 from Ljubljana to London Stansted diverted to Cologne today.

"The Captain took the decision as a precaution to enable the aircraft to go through additional security checks in Cologne where the aircraft was met by the police."

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They added: "In compliance with the local authorities guidance passengers disembarked to allow additional security checks to be performed.

"We plan to operate the flight tomorrow morning and so are providing all passengers with hotel accommodation and refreshments along with regular updates.

"We thank passengers for their understanding. The safety of easyJet's passengers and crew is our highest priority."

Three passengers questioned by police were released without charge, it was revealed on Sunday.

2 An easyJet flight had to be diverted after a passenger reportedly overheard a suspicious conversations Credit: Alamy

A spokesman for Cologne-Bonn airport said: "A plane on the way from Ljubljana to London has landed this evening around 6.30pm in Cologne unplanned.

"Prior to this, the pilot had been informed about a suspicious conversation on board, after which he decided to make an unscheduled landing in Cologne/Bonn.

"After the safe landing of the aircraft of the type A319, the 151 passengers left the machine via emergency slides and were taken to a transit gate.

"The police have been informed and have taken action.

"Thus, passengers had to undergo a check immediately after landing."