A mosque in suburban Minneapolis, Minnesota was targeted by an apparent bomb attack on Saturday as worshippers were preparing for morning prayers.
The blast at about 5am caused a fire the imam's office but did not injure anyone, community officials said.
Police chief Jeff Potts said investigators were trying to determine the cause of the blast at the Dar Al Farooq Islamic Centre in Bloomington.
Asad Zaman, director of the Muslim American Society of Minnesota, said a witness saw something being thrown at the imam's office window from a "van or truck" before the blast that may have been a fire bomb.
Mohamed Omar, the centre's executive director, said a worshipper saw a pickup truck speeding away afterward.
There were 15 to 20 people inside the mosque when the blast happened. Worshippers managed to extinguish the blaze before firefighters arrived, the society said.
The mosque, which primarily serves people from the area's large Somali community, occasionally receives threatening calls and emails, Mr Omar told the Star Tribune newspaper.
The mosque serves as a religious centre and community organising platform for Muslim activists and leaders in the area, the society said.
It is offering a US$10,000 (Dh36,700) reward for information that leads to an arrest or conviction.
The FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are assisting in the investigation.
How to become a Boglehead
Bogleheads follow simple investing philosophies to build their wealth and live better lives. Just follow these steps.
• Spend less than you earn and save the rest. You can do this by earning more, or being frugal. Better still, do both.
• Invest early, invest often. It takes time to grow your wealth on the stock market. The sooner you begin, the better.
• Choose the right level of risk. Don't gamble by investing in get-rich-quick schemes or high-risk plays. Don't play it too safe, either, by leaving long-term savings in cash.
• Diversify. Do not keep all your eggs in one basket. Spread your money between different companies, sectors, markets and asset classes such as bonds and property.
• Keep charges low. The biggest drag on investment performance is all the charges you pay to advisers and active fund managers.
• Keep it simple. Complexity is your enemy. You can build a balanced, diversified portfolio with just a handful of ETFs.
• Forget timing the market. Nobody knows where share prices will go next, so don't try to second-guess them.
• Stick with it. Do not sell up in a market crash. Use the opportunity to invest more at the lower price.
WHAT IS A BLACK HOLE?
1. Black holes are objects whose gravity is so strong not even light can escape their pull
2. They can be created when massive stars collapse under their own weight
3. Large black holes can also be formed when smaller ones collide and merge
4. The biggest black holes lurk at the centre of many galaxies, including our own
5. Astronomers believe that when the universe was very young, black holes affected how galaxies formed
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