Continued bomb warnings on planes in Europe After receiving threats to air traffic, additional security forces were deployed at Copenhagen Airport in Denmark. Czech police have taken security measures after receiving reports of threats to use bombs on planes arriving at Prague airport. Following the report of the presence of a bomb, the flight path from Prague to Rome was also changed to the airport of Venice, Italy. The Portuguese police reported receiving a false warning about the presence of explosives on a plane that took off from Lisbon.