The FBI says an improvised explosive device went off in a Bloomington Islamic Center just before dawn on Saturday as they were gathering for their first prayers of the day.

According to KSTP  the blast was at the Dar Al-Farooq Islamic Center, which is on the 8200 block of Park Avenue South. The report said something came through an office window during morning prayers and set off sprinklers in a ball of fire. A van or pickup truck was seen driving by before the explosion.

The building sustained a large amount of damage near an office. No injuries have been reported.

A $10,000 reward for information about the case by the Muslim American Society of Minnesota. The FBI and the Bloomington Police and the Bureau of Alcohol, Tobacco, Firearms and Explosives are working the investigation.

The FBI asks anyone with information to call 1-800-225-5324.