NEW YORK -- Police and the FBI are investigating a threatening letter sent to the Manhattan apartment of Donald Trump's son Eric that contained a white powder, two law enforcement officials said Friday.
• PHOTOS: Donald Trump's son threatened
Preliminary tests on the substance in the envelope sent to Eric Trump's apartment Thursday indicated it was not hazardous, according to the officials, who were not authorized to disclose details of the threat and spoke to The Associated Press on condition of anonymity.