SOFIA: An aeroplane with 161 people aboard made an emergency landing in the Black Sea city of Burgas on Thursday, following a bomb threat while en route to Egypt from Poland's capital of Warsaw, Bulgarian authorities said.

All passengers and crew were evacuated, but no explosives have been found aboard, a spokeswoman for the Burgas airport told Reuters, adding that the airport remained closed.

"The plane landed in Burgas at 05.48 am (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," the press officer said.

A passenger who alerted crew about a possible bomb admitted on questioning to having consumed alcohol, a police spokeswoman said.

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.