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A letter containing an unidentified substance addressed to Donald Trump Jr. was sent to a Manhattan apartment building unit that belongs to Trump Jr.'s wife, Vanessa, the president's daughter-in-law, multiple senior law enforcement officials and city officials tell News 4 and NBC News.
A preliminary investigation suggests the substance mailed to the East 54th Street apartment is not hazardous but investigators are conducting a thorough probe out of an abundance of caution, the officials said.