(NEW YORK) — Envelopes containing a white powder that were found at a government building in New York City housing an Immigration and Customs Enforcement office did not contain any dangerous substances, officials said Friday.

The incident occurred Thursday afternoon at 26 Federal Plaza, in Manhattan’s Foley Square, New York City Mayor Eric Adams said .

The five letters were found at about 4 p.m. in the mailroom of the ICE Enforcement and Removal Office on the ninth floor, according to the FBI.

“In the majority of my experience, most of these incidents turn out to be nothing. However, this matter is not going to be taken lightly,” said Christoper Raia, the FBI assistant director in charge of the FBI’s New York field office, who noted that “sending threatening letters of this natu

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