An envelope containing a mysterious white powder addressed to Donald Trump Jr. that was sent to a Manhattan apartment building unit that belongs to Trump Jr.'s wife, Vanessa, on Monday had a Boston area postmark, senior law enforcement officials told NBC News.
The unidentified powder, mailed to the East 54th Street apartment, was determined not to be hazardous and was being taken to a lab in the city for futher analysis, an NYPD spokesman said. It's not clear yet who sent the envelope.
Vanessa Trump, 40, opened the letter Monday morning and was decontaminated at the scene as a precaution, according to a senior official with knowledge of the investigation. She called 911 to report coughing and nausea.
She was taken to a hospital for observation, also strictly as a precaution, according to three senior officials. Sources initially said that two other people were taken to hospitals. There's no indication that anyone was hurt.
The FDNY responded to a call about a suspicious substance at the building shortly after 10 a.m.. The nature of the powder wasn't immediately clear, though it appears to be corn starch. Lab test results are expected back Tuesday morning.
It wasn't immediately clear if there was a written note in the accompanying envelope.
Police and other emergency units remained on the scene Monday afternoon as NYPD intelligence detectives and Secret Service agents investigated. The area was shut down for a time but had reopened by about 2 p.m.
“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. "This is an active investigation and we cannot comment any further.”
Trump Jr. married Vanessa Trump, formerly Vanessa Kay Haydon, in November 2005 at Mara-a-Lago. Trump Jr.'s aunt officiated. The couple has five children; none of the kids were home at the time of the incident.
Michael Cohen, President Donald Trump's personal attorney, said in a statement, "How disturbed must a person be to do what they did to a mother of five young children? This dangerous and reckless act goes beyond political differences."
In March 2016, police detectives and FBI agents investigated a threatening letter sent to the Manhattan apartment of Donald Trump Jr.'s brother, Eric, that also contained a white powder that turned out to be harmless. Envelopes containing white powder were also sent to Trump Tower, which served as Trump's campaign headquarters, twice in 2016.