"Preliminary investigation indicates the explosion was caused by a destructive device in violation of federal law", police said via Twitter.
Police say no one was injured in the blast at Dar Al-farooq Islamic Center at about 5:05 a.m.
One worshipper saw a pickup truck speeding away afterward, said Mohamed Omar, the center's executive director.
"I was shocked. It was first prayer, it was 5 a.m. and the whole neighborhood was calm, people were supposed to be sleeping". "We didn't know what was happening but it was scary".
There were 15 to 20 people were gathered for morning prayers when the explosion occurred.
Omar said the center has received threatening or hateful phone calls and emails in the past.
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The defense argued that Roy had been determined to take his own life and that Carter was troubled and was simply "dragged" into Roy's suicidal journey.
Federal investigators are in Bloomington Sautrday after a reported explosion at an Muslim community center. Local leaders and faith groups denounced the attack.
A spokesman for the Muslim American Society of Minnesota told CNN affiliate WCCO the group believes someone may have thrown something into the window of the mosque imam's office. "We need an America where people are safe with their neighbors".
"If a bias motive is proven, this attack would represent another in a long list of hate incidents targeting Islamic institutions nationwide in recent months", Malik said. CAIR said in a report last month that anti-Muslim hate crimes in the United States almost doubled in the first half of this year over the same period in 2016.
A blast shook a rural Minneapolis mosque early Saturday morning, specialists said.
The center attracts Muslims from around the metropolitan Minneapolis-St. Paul metropolitan area, the Associated Press reported.
"An attack on a mosque is an attack on a synagogue is an attack on a church", said Curtiss Deyoung, CEO of the Minnesota Council of Churches. "We are strong and we don't want to lose hope because of things that happen". Worshippers managed to extinguish the blaze before firefighters arrived, according to a statement from the Muslim American Society of Minnesota. "We're here to help each other, to support each other".
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