Explosive Device Thrown Under Boston Police Cruiser

BOSTON (AP) _ Boston Police say it appears as if someone used an explosive device to set a police cruiser on fire.

Commissioner William Evans says no one was hurt when the device exploded in South Boston on Friday morning.

He says what appeared to be a propane tank was placed between a bridge and the cruiser, and when the cruiser pulled away the device went off.

He called the incident ``troubling.''

He says the explosion was likely caught on surveillance video.

There have been no arrests.

The FBI is assisting in the investigation.