Had he suspected arson, the flat would have had to be sealed for investigation.

Officials suspect arson, and investigators were waiting for a chance to search for evidence.

Officials suspect arson as the cause of this unexpected fire.

We suspected arson, but the explosion destroyed most of the evidence.

Officials said they suspected arson and were investigating further.

All of the initial fires were set within five hours of each other, making authorities suspect arson.

He claims that propane tanks inside the building exploded, but suspects arson due to the bootprints around the area.

Q. What do you do when you suspect arson?

They would suspect arson immediately, of course.

The cause of the blaze is still under investigation, but residents suspect arson, since one of the two vacant buildings had burned the week before.