21.   The Nepalese authorities informed them that tensions between India and Pakistan prevented any helicopter from reaching the area.

22.   The pilots said they intervened to prevent the helicopters from flying over areas the government considers sensitive.

23.   Thick cloud cover on Monday prevented helicopters from reaching a remote military base high in southwestern mountains where a small army unit was apparently overwhelmed by leftist rebel attackers.

24.   Thick fog prevented a helicopter from evacuating the people.

25.   Tipnis, the air force commander, said high tides were preventing Indian helicopters from gathering more debris, which was strewn across a broad area.

26.   Tons of food and thousands of tents and blankets have been sent but bad weather has prevented helicopters from reaching the areas of heaviest damage, the radio said.

27.   Two busloads of police launched a search Saturday morning, but the rough weather prevented helicopters from taking off.

28.   Haasbroek said that snow up to two metres deep in some areas had prevented helicopters from landing.

29.   High winds had prevent rescue helicopters from reaching him earlier.

30.   A heavy cloud cover shrouded the hilltop and prevented rescue helicopters from landing Wednesday night.