Trump's daughter-in-law taken to hospital over suspicious letter

President TrumpDonald John TrumpTrump directed Cohen to lie to Congress about plans to build Trump Tower in Moscow during 2016 campaign: report DC train system losing 0k per day during government shutdown Senate Republicans eye rules change to speed Trump nominees MORE’s daughter-in-law was taken to the hospital as a precaution on Monday after she opened a letter containing an unidentified substance, the New York City Police Department said.

The letter was addressed to Vanessa Trump’s husband, Donald Trump Jr.Donald (Don) John TrumpWatchdog group: Trump had over 1,400 conflicts of interest in first two years CNN's Gergen: Trump discouraging next generation from civil service The Hill’s 12:30 Report: Trump AG pick Barr grilled at hearing | Judge rules against census citizenship question | McConnell blocks second House bill to reopen government MORE He is the eldest son of the president and his first wife, Ivana. 

ADVERTISEMENT

An initial review indicated the the substance was not hazardous, police said.

The Secret Service confirmed in a statement that it is working with law enforcement partners to investigate a suspicious package sent to one of its protectees. 

NBC News first reported the incident. Three residents in total were taken to the hospital after the letter was opened, according to NBC.

Trump Jr. is leading the Trump Organization with his younger brother, Eric. He has been a central figure in the investigation into Russian meddling in the 2016 presidential election after he met with a Russian lawyer who promised damaging information on Democratic nominee Hillary ClintonHillary Diane Rodham ClintonDershowitz to The Atlantic: Do not violate Constitution to safeguard it Why Joe Biden (or any moderate) cannot be nominated GOP Rep. Tom Marino resigns from Congress MORE.

Updated: 3:03 p.m.