Keith Stokes died on 19 June 2010, cause unknown.

Fay's story was that the steering went out, cause unknown.

But causes unknown to the paladin were at that very time interposing obstacles to its success.

The 735th Guards Infantry Regiment of the 191st division is also off the air, cause unknown.

It was filed under disaster, cause unknown.

Wasp was lost, cause unknown, in the Atlantic in early autumn, 1814.

The gallant submarine, veteran of seven successful war patrols, was listed as lost in action against the enemy, cause unknown.

The answer was hardly reassuring: "Cause unknown."

Last British submarine lost in World War I, on or about 23 October 1918, cause unknown.

A second building burned in October 2010, cause unknown.