Trump Jr. thanked first responders in a tweet for their \"decisive action\" and support.

A special thanks today to the great men & women of the @NYPDnews @FDNY @SecretService @NewYorkFBI and the Joint Terrorism Task Force for their decisive action and incredible words of support to my wife and family. Their professionalism under pressure made a rough day manageable.

— Donald Trump Jr. (@DonaldJTrumpJr) February 12, 2018

\"The substance was deemed to be nonhazardous and is being transported to a lab in New York City for further analysis,\" NYPD Assistant Commissioner J. Peter Donald said.

The U.S. Secret Service is also investigating, the NYPD said.

\"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. This is an active investigation and we cannot comment any further,\" the Secret Service said in a statement.

\"PHOTO:
Paul J. Richards/AFP/Getty Images/FILE
PHOTO: Donald Trump's daughters-in-law Lara Yunaska and Vanessa Haydon sit with daughter Tiffany Trump before the start of the second presidential debate at Washington University in St. Louis, Oct. 9, 2016.
>

First daughter Ivanka Trump posted a message to Vanessa Trump, her sister-in-law, on Twitter, sending her well wishes.

\"Thinking of @MrsVanessaTrump & wishing I was by her side today. No one deserves to be frightened this way. There is no excuse,\" Ivanka Trump's tweet reads.

Thinking of @MrsVanessaTrump & wishing I was by her side today. No one deserves to be frightened this way. There is no excuse.

— Ivanka Trump (@IvankaTrump) February 12, 2018
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