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(Image: KONTAKT)

The flight from Warsaw to Hurghada in Egpyt made an unscheduled landing in Bulgaria after the threat.

Bulgarian news broadcaster Nova TV claims a 64-year-old man made the threat.

He is being questioned by police at Sarafovo airport in Burgas at 5.45am.

All 161 passengers were evacuated from the plane.

The passenger who made the threat may have been drinking alcohol, the Bulgarian Interior Ministry has said.

Polish Small Planet Airlines revealed the passenger who made the bomb threat said "it was only a joke".

Polish news agency RMF24 reports anti-terror forces stormed the plane and grabbed the passenger who made the alleged bomb threat.

Police shouted: "Where is the bomb, where is the bomb?".

(Image: LOT.COM)

Witnesses on board claim the man made comments joking about a bomb being on board prior to take off.

(Image: KONTAKT)

A Burgas airport spokesman said: "The plane landed in Burgas at 05.48 a.m. (0348 GMT) after a request for flight number LLP8015 travelling from Warsaw to Hurghada to make an emergency landing, due to a report of the presence of explosives on board."

A spokesman for Polish national carrier LOT said the aircraft did not belong to the airline but was a charter, destined for the Egyptian city of Hurghada.

(Image: NOVA.TV)

Yesterday two Paris-bound passenger planes were diverted after reportedly receiving bomb threats.

Europe has been on a heightened state of alert following the Paris terror attacks on Friday (November 13).

The threat comes just weeks after the Russian Metrojet plane was downed by an ISIS bomb over Sinai, Egypt.

The crash killed 224 people on board and forced Russia into launching cruise missiles at ISIS targets in Syria.

ISIS propaganda magazine the Dabiq claimed a bomb in a soda can brought down the plane.