Police are investigating an explosion — possibly of some type of device — outside a Potomac mansion Wednesday night, according to WTOP.

The blast blew out a window and damaged a room in the home, but no one was injured, the radio station reports. No one was home at the time.

Firefighters noticed an unusual smell when they arrived at the scene in the 9200 block of Ingleside Drive shortly after the blast, which occurred around 9:15 p.m. They called a hazardous materials team to investigate.

NBC 4 reports police used special dogs to look for other explosive devices, but none were found.

Check back with PostLocal for more details.

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