President Trump's daughter-in-law was taken to a hospital Monday after she opened a piece of mail addressed to her husband that contained an unknown white powder, police sources said.
Specialist officers that deal with hazardous materials were sent to the apartment on East 54th Street, although a police spokesman said a preliminary test indicated the powder was not risky.
Later Trump Jr. also tweeted about the envelope and said that he was thankful that his wife and kids were safe.
The Trump family expressed disgust over the Monday incident. It's unclear what the powder was. Police and Secret Service agents are continuing to investigate.
She thanked New York City firefighters, police and the Secret Service for their "quick response" in making sure she was safe.
The NYPD said the white powder in the envelope was deemed to be non-hazardous and was taken to a lab for further analysis. A 911 call was placed, and Trump, Haydon, and an unidentified third person were taken to New York-Presbyterian Hospital as a precautionary measure.
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Since 2001 when envelopes laced with anthrax were sent to media outlets and USA lawmakers, claiming five lives, the authorities have been on alert.
"The Secret Service and our law enforcement partners in New York City are investigating a suspicious package addressed to one of our protectees received today in New York, New York", the agency said in a statement.
"No one deserves to be frightened this way", Donald Jr.'s sister Ivanka tweeted.
"I know the President spoke with her".
Both Donald Trump Jr and Ivanka Trump have commented on the incident on social media, both asserting that it is an bad act that should not be inflicted upon anyone.
Donald Trump Jr. and his wife Vanessa Trump on January 20, 2017.