Who put a small explosive device outside the window of a Potomac home?
Fire investigators and the FBI are trying to answer that question.
A pipe bomb went off at about 9:15 p.m. Wednesday. A series of calls came in to 911. Residents in the area reported hearing the sound of an explosion.
Emergency responders began to drive around the area and ended up in the 9200 block of Inglewood Drive, where they smelled a strange sulfuric odor. After taking a closer look, investigators realized that a small device had exploded outside the window of a $3.3 million home.
The device blew out a window and caused some minor damage to one room.
Investigators used special dogs to look for additional explosives, but none was found. They did find a unique necklace at the scene that may be related to the crime.
The residents were not home at the time of the explosion. No one was hurt, but authorities said if anyone had been in the vicinity, they could have died, NBC Washington's Jane Watrel reported.
Stay with NBCWashington.com for more information.