The precise cause of the man's death was still a mystery yesterday.

Last week, a woman died, although no one knows the precise cause.

Officials said it would take some time to determined the precise cause of the crash.

There is, however, disagreement in Washington as to the precise cause.

But they say the lack of consensus on the precise cause makes it hard to deal with the increase.

The precise cause of the fire was still being investigated.

But many have yet to learn the precise cause of death, which in almost all cases was due to gas.

The precise cause for this is not known, and no reason was given him.

The precise cause or causes of the syndrome are not known.

The precise cause of the failure is not yet known.