Law enforcement agencies are investigating a threatening letter containing white powder that was sent to Donald Trump's son, Eric, at his Manhattan residence that said the GOP presidential front-runner's children are in danger if he doesn't drop out of the race.
Sources told CBS News
that the Secret Service, FBI, and New York Police Department are all involved in the investigation into the letter, which the younger Trump's wife opened at their apartment at Trump Parc East, located at 100 Central Park South.
The letter said: "If your father does not drop out of the race, the next envelope won't be a fake." It was signed "X," according a law enforcement officials who saw it.
The powder has been sent to a lab for testing, but a source told CBS that a field test showed the substance did not appear to be hazardous, and nobody was injured.
The New York Police Department confirmed that the handwritten letter, bearing a Boston postmark, had been received and that it responded to a call at about 7:15 p.m., but didn't identify the recipient as Eric Trump, 32, reports ABC News.
The letter was received amid escalating protests at Trump's rallies, including unrest that resulted in his decision to cancel an event in Chicago last weekend.
Earlier this week,
Senate Majority Leader Mitch McConnell called on Trump to condemn all violence at his rallies, and House Speaker Paul Ryan said he is concerned about the growing incidents.
On Tuesday, Marco Rubio's Washington D.C. campaign office was evacuated
after white powder was found in an envelope.
After the the fire department tested the powder and found that it was not hazardous, employees were allowed back into the office. Rubio, who has since dropped out of the presidential race, was in Florida when the incident occurred.
Material from The Associated Press was used in this report.
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