Five envelopes containing a mysterious white powder sparked evacuations at a New York ICE hub accused of caging migrants in horrific conditions.

Hazmat teams were dispatched to the 9th floor of 26 Federal Plaza in Manhattan after Immigration and Customs Enforcement officials came into contact with the “unknown white powder” stashed inside five envelopes found in the department’s mail room.

The building has been the subject of protests and complaints that it houses detained migrants in miserable conditions.

Two people came into contact with the mystery substance, and the building was evacuated, although officials have reported no illnesses or injuries to employees.

“No threat remains to any employees or the public at this time,” said Christopher Raia, the FBI’s assistant director in New

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