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Three UK citizens' terror talk causes flight to be grounded

easyJet(COLOGNE, Germany) -- Three British men were detained in Germany late Saturday after allegedly having conversations involving terrorism on board a flight from Slovenia to London. The men were released Sunday, ABC News has learned.

Police in Cologne, Germany, where the flight was diverted, released a statement indicating that officers questioned the men -- aged 31, 38 and 48 -- and examined their cellphones, but did not find evidence that they were plotting a terror attack.

The incident, which took place on a flight by easyJet, a low-cost British airline, reflects the level of concern about terror in Europe following the three ISIS-inspired attacks that have taken place in the United Kingdom since March.

“EasyJet can confirm that flight EZY3246 from Ljubljana to London Stansted diverted to Cologne on June 10," the airline said in a statement. "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."

“We thank passengers for their understanding," easyJet said in the statement. "The safety of easyJet's passengers and crew is our highest priority.”

The situation began when a female passenger overheard a conversation between the men on the flight Saturday, police said.

One of the men had a book with a picture of a sniper rifle on it, along with the word "kill," police said.

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