31.   Arafat had been due here Saturday but postponed the trip, saying that bad weather had prevented his helicopter from lifting off from Gaza City.

32.   Bad weather, especially in the north, has on several occasions prevented helicopters carrying surveyors from landing.

33.   Fog prevented helicopters from taking part in the operation, the ministry spokesman said.

34.   Their helicopter took off immediately after Shehu stepped out of it -- and later the crowd prevented the helicopter from setting down again to evacuate him.

35.   The helicopter took off immediately after Shehu stepped out of it and the crowd prevented the helicopter from setting down again to evacuate him.