Three people, including detainees, have been shot at a U.S. Immigration and Customs Enforcement facility in Dallas and the shooter is dead from a self-inflicted gunshot wound, federal authorities said.

Acting ICE Director Todd Lyons confirmed the shooting during an interview on CNN on Wednesday. Homeland Security spokesperson Tricia McLaughlin later told Fox News that no ICE agents were injured. “We believe he was shooting at law enforcement and detainees from an apartment building,” McLaughlin said. “Detainees were among the victims of the shooting.”

The FBI said during a news conference Wednesday morning that it was investigating the shooting as “an act of targeted violence.”

“Early evidence that we’ve seen from rounds that were found near the suspected shooter contain messages that were anti-ICE in nature,” said Joe Rothrock, special agent in charge of the Dallas field office.

AP video shot by Jamie Stengle