Investigators say they're trying to determine what type of device was detonated outside a $2.6 million mansion that sits at 9214 Inglewood Drive.
Right now they don't have a motive for the crime, but are examining evidence gathered from the scene, including a metallic necklace that reads "Jennifer" in Hebrew. Police say the unique necklace may be related to the explosion.
Court records show both of the home's owners are Iranians with permanent residency in the United States.
Montgomery County Fire and Rescue crews arrived at the 7,500-square-foot home Wednesday night after neighbors reported hearing several loud blasts. When hazardous materials crews arrived on scene, they discovered an explosive device had been placed outside of the home and close to a first floor window. No one was home when the device went off and no one was injured.
Investigators are combing through surveillance tapes from surrounding properties for clues in the case.
Anyone with information about the incident is urged to call the Montgomery County Fire and Explosives Tip Line.
To contact the Montgomery County Fire and Explosives Tip Line, call (240) 777-2263.
CORRECTION: This story originally stated that the explosion occurred yesterday. An explosion was reported Wednesday night.