21.   At least six Americans were killed and an unknown number wounded when their helicopter was shot down over eastern Afghanistan, Pentagon sources said Monday.

22.   Cause of the crash was not immediately known, but there was no evidence the helicopter was shot down, Navy spokesman Lt. Rick Haupt said in Washington.

23.   Colombian rebels have shot down helicopters before.

24.   Dagestani television quoted refugees as saying two Russian helicopters had been shot down, but there was no official confirmation of that report.

25.   Early reports were contradictory, with some witnesses saying a rebel helicopter had been shot down and crashed.

26.   Eighteen Rangers were killed in the battle and two Blackhawk helicopters were shot down.

27.   He denied that the helicopter was shot down by rebels while trying to rescue the hostages.

28.   In one incident, a Chinook helicopter was shot and crashed.

29.   In Vietnam, his helicopter was shot down four times and crashed six times.

30.   It was unclear whether the two-seat helicopter was shot down or made an emergency landing.