The FBI is leading an investigation into the early Saturday detonation of an explosive device at a mosque near Minneapolis.
The explosion, caused by an improvised explosive device, went off as people were preparing for morning prayers, damaging a room but not causing any injuries, authorities and witnesses said.
A GoFundMe account, set up to raise funds to rebuild the community center and mosque, reached nearly $17,000 as of Sunday.
The blast happened at around 5 a.m. at the Dar Al-Farooq Islamic Center in Bloomington, according to police. Windows of the imam's office were shattered, either by the blast or by an object thrown through them, the Minneapolis Star Tribune reported.
"We came to this country for the same reason everyone else came here: freedom to worship," Yasir Abdalrahman, a worshipper at the mosque, told the newspaper. "And that freedom is under threat. Every other American should be insulted by this."
Investigators will try to determine whether the incident was a hate crime and who may have been behind it. The group is offering a $10,000 reward for information that leads to an arrest or conviction.
A $10,000 reward also is being offered by the Minnesota chapter of the Council on American-Islamic Relations, or CAIR. The group said its national office is urging Islamic centers and mosques to step up security.
Along with a mosque, the building houses a community center that hosts computer classes, a basketball league, religious classes, lectures and other events.
Minnesota is home to the largest Somali community in the U.S., roughly 57,000 people, according to the latest census figures. The immigrants have been coming to Minnesota from their war-torn homeland since the 1990s, drawn by generous social services and the sense of community among the diaspora.
The Associated Press contributed to this report.