A person deployed an “incendiary device” Monday morning outside a New York building housing an immigration court and other U.S. federal offices before being taken into custody at the scene.

Axar.az reports, citing CTV News, that the FBI said its New York Joint Terrorism Task Force was investigating the eruption of smoke and flames outside of 26 Federal Plaza, which has become a focal point for demonstrations against the immigration policies of President Donald Trump’s administration.

The individual in custody, whose name has not been released, was carrying anti-ICE material, according to preliminary information gathered by law enforcement and described by a person familiar with the matter who was not authorized to discuss an ongoing investigation by name.

The New York Fire Department said it was called at about 8:30 a.m., and initial reports indicated an outdoor fire. One person was transported to the hospital, but their injuries weren’t life-threatening, the department said.