Well, he didn't believe the accident had been caused by anyone.
Air Force officials said they had no idea what caused the accident.
Police said they did not know what caused the accident.
This caused an accident leading to death in early 2011.
It is thought the accident was caused by poor construction.
On the other hand, an accident is caused (by bad road conditions, for example) but not made.
It is an event or a series of events on the road that caused the accident.
What then are some of the hazards in the home environment which can cause accidents?
And it is hard for them to cause an accident.
Three years ago my husband died in an accident caused by a driver using a cell phone.