An attacker armed with a rifle was killed after ramming his vehicle into one of the nation’s largest Reform synagogues Thursday in what federal investigators said was an act of violence targeting the Jewish community.

Jennifer Runyan, the special agent in charge of the FBI’s Detroit field office, said at a news conference on Thursday called the incident “deeply disturbing and tragic” and said the FBI was leading the investigation.

The agency considered the crime a “targeted act of violence against the Jewish community,” she said. Investigators have not determined a motive yet.