The FBI has returned a priceless manuscript page signed by Spanish conquistador Hernán Cortés to Mexico MEXICO CITY — Nearly five centuries after Spanish conquistador Hernán Cortés signed it and decades after someone swiped it from Mexico’s national archives,

The Federal Bureau of Investigation announced Thursday night it is investigating five envelopes containing an unknown white powder found at a federal building in Lower Manhattan. The letters were found in the mailroom of Enforcement and Removal Operations on the ninth floor at 26 Federal Plaza at around 4 p.

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,