Suspicious Letter With Unknown Substance Sent to Manhattan Apartment of Trump Daughter-in-Law: Sourc

A letter containing an unidentified substance addressed to Donald Trump Jr. was sent to a Manhattan apartment building unit that belongs to Trump Jr.'s wife, Vanessa, the president's daughter-in-law, multiple senior law enforcement officials and city officials tell News 4 and NBC News.

A preliminary investigation suggests the substance mailed to the East 54th Street apartment is not hazardous but investigators are conducting a thorough probe out of an abundance of caution, the officials said.

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Vanessa Trump and two others were taken to a hospital for observation, strictly as a precaution, after the letter was opened Monday morning, according to three senior officials. There's no indication they suffered any injuries and the identities of the other two people taken to the hospital weren't immediately clear.

Read the full story on NBC 4.