Federal authorities are investigating after envelopes containing an unidentified white powder were found at a government building in New York City that houses an Immigration and Customs Enforcement office, officials said Thursday.

A New York City building housing an Immigration and Customs Enforcement facility was evacuated after unknown white powder in multiple envelopes was found at the complex, authorities announced on Thursday.

Envelopes with white powder were discovered Thursday in New York City in an Immigration and Customs Enforcement (ICE) facility, according to the Big Apple’s Mayor Eric Adams. “New Yorkers, I have been preliminarily briefed on the matter unfolding at 26 Federal Plaza where envelopes containing white powder were discovered,