Passengers on a flight from the US to Ireland were questioned by police after a bomb threat was made against the aircraft, Irish officials said.
Police received a warning that there were explosives on board
The aircraft landed at Shannon airport in south-west Ireland just before 0700 GMT, and passengers and their luggage were taken for a security inspection.
The alert, which has now ended, came after police received a telephone call saying there were explosives on board.
The 239 passengers, en route to Dublin, were cleared to continue their journey.
The Aer Lingus aircraft Flight 112 was searched by police after it made the scheduled stop and landed at the airport.
No traces of explosives were found on board.
"It wasn't an emergency landing. It wasn't a red alert. The flight was coming here anyway," said airport spokesman Eugene Pratt.
It is the latest in a series of security alerts to affect airlines since authorities foiled an alleged plot to blow up US-bound flights from the UK earlier this month.