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Vanessa Trump, the wife of Donald Trump Jr., was taken to a New York City hospital as a precaution on Monday after she opened a letter containing an unknown white powder.

The letter was addressed to Trump Jr. and sent to the couple's Manhattan apartment.

After Vanessa Trump opened the envelope at approximately 10:00am ET and discovered the powder, she and two other people were decontaminated by firefighters at the scene and taken to a nearby hospital for evaluation.

Police and Secret Service agents are at the scene investigating. The white powder was determined to be non-hazardous, New York City police told Fox News.

Stay with Fox News Channel for more on this developing story.

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