"All the passengers have already left the aircraft, but at this moment I can't yet officially confirm that it was a false alert, as the search will still take several hours," Czech police spokeswoman Katerina Rendlova told AFP.
She said a man told the Czech carrier CSA that "terrorists" were carrying a bomb aboard the flight in a call placed at 0833 GMT, an hour before the plane landed at Vaclav Havel Airport Prague.
Airport traffic had not been affected, airport spokeswoman Marika Janouskova told AFP.