1.   The helicopters slammed together before plummeting to the ground.

2.   A Thai Army helicopter slammed into an electric power pole in central Thailand Wednesday, killing all four of its crew.

3.   As soldiers in foxholes lobbed shells into the trees, a U.S.-donated helicopter slammed a rocket at imaginary guerrilla columns advancing on the remote Amazon outpost.

4.   On Thursday, a Black Hawk combat helicopter slammed into a mountain near Dabeiba in northwest Antioquia State while trying to unload troops into battle.

5.   Several civilians were killed and more wounded when the helicopter slammed into the ground and burst into flames.

6.   The helicopter apparently slammed into the mountain and exploded.

7.   The helicopter slammed into an unoccupied car at University Hospitals of Cleveland and broke into pieces, with only the tail recognizable in the twisted wreckage.

8.   The U.N. helicopter slammed into a fog-shrouded mountain in central Bosnia and burst into flames.

9.   Three firefighters died Friday when their helicopter slammed into a car dealership on the outskirts of this city in eastern Portugal.

10.   A police helicopter slammed into Harvard University boathouse on the banks of the Charles River Wednesday, killing at least four people, authorities said.