11.   Aides said they whisked Arafat to an underground shelter Tuesday as they heard Israeli helicopters approaching his headquarters in the West Bank town of Ramallah.

12.   After four hours in the water, they heard a helicopter and set off smoke flares.

13.   Fatah employees meeting with Mansour in the eight-floor building said they heard helicopters flying overhead before three missiles struck.

14.   Fatah employees meeting with Mansour in the eight-floor building said they heard helicopters flying overhead before the strike.

15.   He said it is possible that children heard the helicopter and aimed a toy laser at it to see what would happen.

16.   He said the military believes children heard the helicopter and aimed a toy laser at it to see what would happen.

17.   Helicopters could be heard overhead, while on the ground new house-to-house fighting erupted in the city center.

18.   If they hear a helicopter, they play dead.

19.   Lundquist was sleeping Monday when she heard a helicopter.

20.   On Tuesday aides had to whisk Arafat to an underground shelter as they heard Israeli helicopters approaching his headquarters in the West Bank town of Ramallah.