Federal agents and the NYPD are investigating after someone sent envelopes full of white powder to 26 Federal Plaza in Lower Manhattan on Thursday afternoon.

Law enforcement sources said the suspicious packages arrived at about 3:40 p.m. on Aug. 14 on the 9th floor of the federal building that is also the site of the Department of Homeland Security's Immigration and Customs Enforcement (ICE) courts. The location has become infamous in recent months as federal agents have seized numerous immigrants appearing at court-mandated hearings on the 12th floor.

Police said the white powder spilled out of the envelopes after someone opened them. Emergency services personnel were called, and all individuals on the ninth floor were evacuated. The FDNY Hazmat Team and the FBI responded to the scene.

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