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

President TrumpDonald John TrumpNFL freezes policy barring players from protesting during anthem McConnell spokesman on Putin visit: 'There is no invitation from Congress' Petition urges University of Virginia not to hire Marc Short 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 TrumpGeorge Will charges that Trump colluded with Putin DNC claims Secret Service blocked attempt to deliver lawsuit against Kushner Secret Service spent nearly 0,000 on protection for Trump's sons during overseas trips 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 ClintonProminent Putin critic: If Trump turns me over, I'm dead Dems unveil slate of measures to ratchet up pressure on Russia Trump tweets old video of Clinton talking up 'a strong Russia' MORE.

Updated: 3:03 p.m.