A judge ruled on Tuesday that the administration must refrain from using the 26 Federal Plaza building to hold immigrants facing deportation unless it reduces the number of detainees and improves cond

Police evacuated 26 Federal Plaza in Manhattan after envelopes containing white powder were discovered Thursday afternoon, officials said.

Initial testing of the white powder found in envelopes in a mailroom at a federal building in lower Manhattan reveals a substance similar to boric acid, according to a senior official familiar with the matter.