LONDON — The British government on Wednesday suspended flights between Britain and the Egyptian resort of Sharm el Sheikh over concerns that a chartered Russian jetliner might have been brought down in the Sinai Peninsula by a bomb on board.

The announcement by Prime Minister David Cameron halting flights was the strongest action so far by any government official to suggest that the plane, which crashed within a half-hour of departing Sharm el Sheikh on Saturday, killing all 224 people on board, was brought down by an act of terrorism.

A European official briefed on the investigation said an initial inspection of the flight data recorder recovered from the plane indicated that the recording ceased abruptly, evidence that would support the theory of a midair explosion.