Threatening letter reportedly sent to Eric Trump
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Authorities are investigating a threatening letter sent to Republican presidential candidate Donald TrumpDonald John TrumpSarah Huckabee Sanders becomes Fox News contributor The US-Iranian scuffle over a ship is a sideshow to events in the Gulf South Korea: US, North Korea to resume nuclear talks 'soon' MORE's son Eric that contained a suspicious white powder, according to reports.
 
The mail was opened by Eric Trump's wife on Thursday, according to CBS News, which reported that a source said it had a Massachusetts postmark. The letter warned that if Donald Trump did not withdraw from the Republican presidential race, his children would be harmed. 
 
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The letter was sent to Eric Trump's Manhattan residence at Trump Parc East. A law enforcement official said it contained a suspicious white powder.
 
New York City police and the FBI are investigating the incident.
 
A preliminary field test of the substance indicated it did not appear to be hazardous, according to reports. No injuries were reported.
 
Eric Trump, 32, is the third-oldest of Donald Trump's five children.