An unexplained fire broke out in one of the vans.

A series of unexplained fires occurred in 1917.

The fort itself was largely destroyed in 1828 by an unexplained fire, but the surviving structures are now maintained as a tourist site.

Unfortunately a few weeks before the sale was due to complete, an unexplained major fire destroyed the scale-up plant and the majority of the bulk stock.

In the 1970's the building was ravaged by an unexplained fire.

Manny could expedite the completion of a building project by insuring that no unexplained fires would take place during the construction process.

This occurred while unexplained fires befell other Nash-owned properties at the time.

Were there any unexplained fires while Ms. Musgrave was here?

We are given to understand that grief has possessed her, ever since that unexplained fire reduced her family home to rubble.

In the following months, London was engulfed by several more unexplained fires which were interpreted as a sign of the impending destruction of the world.