IED caused blast at Minnesota mosque, none arrested yet: FBI

An "improvised explosive device " caused blast at a suburban Minneapolis mosque when worshippers were gathering for morning prayers, according to the FBI.

No one has been arrested yet. Congregants and neighbours expressed relief that there were no injuries, but also reacted with shock and dismay.

According to authorities, no one was hurt in the explosion at the Bloomington Islamic Center, but heavily damaged an imam's officeand sent smoke wafting through the large building.

Windows in the office were shattered, either by the blast or by an object thrown through them.

When police arrived, they found smoke and fire damage to the building, said Bloomington Police Chief Jeff Potts.

Agents from the FBI and the Federal Bureau of Alcohol, Tobacco, Firearms and Explosives soon joined the investigation.

At a news conference Special Agent in Charge Richard Thornton said an "improvised explosive device" caused the blast, but that investigators still must determine "who and why."
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