(1) Somewhere, off in the distance, a klaxon sounded and everyone around me started running.(2) the tug blew its klaxon three times(3) After all the excitement had died down and we were getting on with what we were doing beforehand, the fire klaxon sounded again.(4) As a police helicopter thundered overhead, many of the demonstrators sounded klaxons and blew horns to make their point.(5) Warning klaxons went off, flooding the room with flashing red light.(6) Alarm klaxons started to sound throughout the corridors.