1.   The crash had occurred at a time of clear visibility and good weather conditions.

2.   The crash occurred when a freight train collided with an incoming passenger train.

3.   There were skid Marks on the road where the crash occurred.

4.   The crash occurred when the crew shut down the wrong engine.

5.   The crash occurred on a sharp bend.

6.   When the head-on crash occurred, the nearest police car was a quarter-of-a-mile behind the stolen vehicle.

7.   Neither the U.S. nor Russian statements made clear whether the crash occurred on or beneath the surface.

8.   Although the crash occurred only a few hundred yards from the nearest house, the site is in difficult terrain in a gully near Raccoon Creek.

9.   An offset crash occurs, for instance, when one vehicle crosses the center line of a highway only part way, hitting just part of the oncoming vehicle.

10.   Authorities have not located any witness who reports the bus was attempting to pass when the crash occurred.