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

President TrumpDonald John TrumpKimberly Guilfoyle reports being asymptomatic and 'feeling really pretty good' after COVID-19 diagnosis Biden says he will rejoin WHO on his first day in office Lincoln Project offers list of GOP senators who 'protect' Trump in new ad 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.Don John TrumpSouth Dakota governor flew with Trump on Air Force One after being exposed to coronavirus: report Gianforte halts in-person campaigning after wife, running mate attend event with Guilfoyle Trump Jr. knocks CNN's Chris Cuomo over interview with father: 'I'm not pretending to be a journalist' MORE He is the eldest son of the president and his first wife, Ivana. 

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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 ClintonHillicon Valley: Facebook civil rights audit finds 'serious setbacks' | Facebook takes down Roger Stone-affiliated accounts, pages | State and local officials beg Congress for more elections funds OVERNIGHT ENERGY: Sanders-Biden climate task force calls for carbon-free power by 2035 | Park Police did not record radio transmissions during June 1 sweep of White House protesters | Court upholds protections for Yellowstone grizzly bears GOP Miami mayor does not commit to voting for Trump MORE.

Updated: 3:03 p.m.