President Trump’s daughter-in-law was taken to a Manhattan hospital as a precaution on Monday after she was exposed to a white, powdery substance when she opened a suspicious letter addressed to her husband, Donald Trump Jr., several news outlets are reporting.

A spokeswoman for the NYPD’s office of the Deputy Commissioner of Public Information confirmed to PEOPLE that Trump Jr.’s family received a letter containing a powdery substance that was tested and proven to be non-hazardous.

The spokeswoman said three people were taken to a local hospital for observation but could not confirm their names.

NBC News reported that, according to senior law enforcement and city officials, Trump Jr.’s wife, Vanessa, was taken to New York Presbyterian-Weill Cornell Medical Center “strictly as a precaution” after a suspicious letter containing an unidentified substance was sent to the couple’s apartment in Manhattan.

NBC News said the letter was addressed to Trump Jr., the eldest child of the president and his ex-wife Ivana. The outlet also reported that “there is no indication anyone suffered any injuries.”

According to law enforcement sources who spoke with the New York Post, Vanessa Trump opened the letter at 10 a.m. at an East 54th Street apartment in Manhattan’s Sutton Place neighborhood.

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