President Donald Trump's daughter-in-law was taken to a Manhattan hospital as a precaution on Monday after a suspicious letter containing an unidentified substance was sent to her apartment, senior law enforcement and city officials told NBC News.

The letter was addressed to Vanessa Trump's husband, Donald Trump Jr., the eldest child of the president and his ex-wife Ivana.

See images of Vanessa Trump:



21 PHOTOS Vanessa Trump See Gallery Vanessa Trump WASHINGTON, DC - APRIL 17: Vanessa Trump attends the 139th White House Easter Egg Roll at The White House on April 17, 2017 in Washington, DC. (Photo by Leigh Vogel/WireImage,) Donald Trump Jr. (R) watches along with his brother in law Jared Kushner (L) and Trump Jr's wife Vanessa (C) as his father Donald Trump (2nd L) celebrates after accepting the Republican presidential nomination at the 2016 Republican National Convention in Cleveland, Ohio U.S. July 21, 2016. REUTERS/Mike Segar Donald Trump Jr takes a picture as he and his wife Vanessa attend the National Christmas Tree Lighting and Pageant of Peace ceremony on the Ellipse near the White House in Washington, U.S., November 30, 2017. REUTERS/Jonathan Ernst Donald Trump's Jr wife Vanessa Trump arrives at Joint Base Andrews outside Washington, U.S., after Easter weekend in Palm Beach, Florida, April 16, 2017. REUTERS/Yuri Gripas Jared Kushner and Vanessa Trump attend the inauguration ceremonies to swear in Donald Trump as the 45th president of the United States at the U.S. Capitol in Washington, U.S., January 20, 2017. REUTERS/Kevin Lamarque Donald Trump Jr. (C) jokes around and motions with a large pair of scissors toward the throat of his wife Vanessa Trump (R) while Too Kim Tiah (L) the CEO of TA Global, the owner and developer of Trump International Hotel and Tower Vancouver, looks on during the grand opening of the Trump International Hotel and Tower in Vancouver, British Columbia, Canada February 28, 2017. REUTERS/Nick Didlick TPX IMAGES OF THE DAY Vanessa Trump arrives on the West Front of the U.S. Capitol in Washington, D.C., U.S., January 20, 2017. REUTERS/Win McNamee/Pool Donald Trump Jr. speaks with his wife Vanessa as he waits for his father Republican U.S. presidential nominee Donald Trump to arrive for an event on the sidelines of the Republican National Convention in Cleveland, Ohio, U.S., July 20, 2016. REUTERS/Carlo Allegri Ivanka Trump, Tiffany Trump, Vanessa Trump, Donald Trump Jr., and Eric Trump (L-R) applaud at the Republican National Convention in Cleveland, Ohio, U.S. July 20, 2016. REUTERS/Mario Anzuoni Donald Trump Jr. and his wife Vanessa attend the second day session at the Republican National Convention in Cleveland, Ohio, U.S. July 19, 2016. REUTERS/Jonathan Ernst U.S. President-elect Donald Trump's son Donald Trump Jr. (adults, from L-R), his wife Vanessa, brother Eric Trump and his wife Lara arrive with their families aboard the U.S. Air Force jet with Trump for his inauguration, at Joint Base Andrews, Maryland, U.S. January 19, 2017. REUTERS/Jonathan Ernst Vanessa Trump, Donald Trump Jr. and Tiffany Trump react after vice presidential nominee Mike Pence paid the family a compliment at the Republican National Convention in Cleveland, Ohio, U.S. July 20, 2016. REUTERS/Jim Young Donald Trump, Jr., son of Donald Trump, entrepreneur and host of the television reality series "The Apprentice" arrives with his wife Vanessa at the party following the live telecast of season five finale in Los Angeles June 5, 2006. REUTERS/Fred Prouser (UNITED STATES) Donald Trump Jr. (L) and his wife Vanessa attend the NBC, Universal Pictures and Focus Features 64th annual Golden Globes after party at the Beverly Hilton Hotel in Beverly Hills, California on January 15, 2007. REUTERS/Phil McCarten (UNITED STATES) Donald Trump Jr. and his fiancee Vanessa Haydon arrive at the wrap party for "The Apprentice" reality television show at Planet Hollywood in New York. Donald Trump Jr. (L) and his fiancee Vanessa Haydon arrive at the wrap party for "The Apprentice" reality television show at Planet Hollywood in New York late May 19, 2005. Real estate mogul-turned reality TV star Donald Trump chose one of his own kind on Thursday, picking Kendra Todd, a real estate entrepreneur as his first female apprentice during the finale of the NBC television show "The Apprentice". REUTERS/Albert Ferreira/Handout Republican U.S. presidential candidate Donald Trump gives a thumbs up to the crowd as his daughter-in-law Vanessa (L) and his son Donald Trump Jr. (2nd L) watch after a Trump campaign rally in New Orleans, Louisiana March 4, 2016. REUTERS/Layne Murdoch Jr. Tony Tiah Thee Kian, chairman ofï¿½TA Global Bhd., from left, his son Joo Kim Tiah, head of Holborn Holdings Ltd. and chief executive officer of TA Global Bhd., Donald Trump Jr., son of U.S. President Donald Trump and executive vice president of Trump Organization Inc., his wife Vanessa Trump, Eric Trump, son of U.S. President Donald Trump and executive vice president of Trump Organization Inc., and his wife Lara Yunaska Trump participate in the ribbon cutting ceremony during the grand opening of Trump International Hotel & Tower in Vancouver, British Columbia, Canada, on Tuesday, Feb. 28, 2017. Trump International Hotel & Tower Vancouver is the first new hotel to bear the name of Trump since he took office. Photographer: Ben Nelms/Bloomberg via Getty Images ST LOUIS, MO - OCTOBER 09: (L-R) Republican presidential nominee Donald Trump's daughters-in-law Lara Trump and Vanessa Trump sit before the town hall debate at Washington University on October 9, 2016 in St Louis, Missouri. This is the second of three presidential debates scheduled prior to the November 8th election. (Photo by Scott Olson/Getty Images) Family members of Republican presidential candidate Donald Trump, (from L-R) daughters-in-law Lara Yunaska and Vanessa Haydon (C) and daughter Tiffany Trump are seen before the start of the second presidential debate at Washington University in St. Louis, Missouri on October 9, 2016. / AFP / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images) (L-R) Republican nominee Donald Trump, Melania Trump, Ivanka Trump, Donald Trump Jr.'s wife Vanessa Trump, Eric Trumps wife Lara Yunaska, and Eric Trump look on from the stage after the first presidential debate at Hofstra University in Hempstead, New York on September 26, 2016. / AFP / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images) ST LOUIS, MO - OCTOBER 09: (L-R) Republican presidential nominee Donald Trump's daughters-in-law Lara Trump and Vanessa Trump and daughter Tiffany Trump during the town hall debate at Washington University on October 9, 2016 in St Louis, Missouri. This is the second of three presidential debates scheduled prior to the November 8th election. (Photo by Scott Olson/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

President Donald Trump's daughter-in-law was taken to a Manhattan hospital as a precaution on Monday after a suspicious letter containing an unidentified white powder was sent to her apartment, senior law enforcement and city officials told NBC News.

The letter was addressed to Vanessa Trump's husband, Donald Trump Jr., the eldest child of the president and his ex-wife Ivana.

After the letter was opened, three people at the residence were taken to New York Presbyterian-Weill Cornell Medical Center strictly as a precaution, the New York City Fire Department said.

There is no indication anyone suffered any injuries; the NYPD said the substance was deemed to be non-hazardous and was taken to a lab for further analysis.

"How disturbed must a person be to do what they did to a mother of five children?'' Michael Cohen, President Trump's personal attorney, said in a statement. "This dangerous and reckless act goes beyond political differences."

The Secret Service said it was investigating and would have no further comment.

Residents who exited the 54th Street building were shocked by the incident.

David Schnall, a 52-year-old lawyer who lives in the building, called the incident “horrible,” and said he’s “upset it happened.”

Schnall also said, “The media is inflaming a lot of hysteria with regard to Trump and this is just a product of that. There is an inflammation of hatred towards the president and anything to do with him, and hopefully this will be a signal for people to stop."

Lois Winston, a psychologist who works and lives in the building, said she doesn’t know any of the affected residents, but she feels “sorry for them” and wishes them well.

"I think it’s terrifying," she said. "I think it’s terrifying that anybody would send a package like that, regardless of who it was to, it’s terrible. But there are so many terrible things right now that it’s not surprising."

Thankful that Vanessa & my children are safe and unharmed after the incredibly scary situation that occurred this morning. Truly disgusting that certain individuals choose to express their opposing views with such disturbing behavior. — Donald Trump Jr. (@DonaldJTrumpJr) February 12, 2018

This is a developing story. Check back for updates.

RELATED: A look at Donald Trump Jr.'s family



9 PHOTOS Donald Trump Jr.'s family See Gallery Donald Trump Jr.'s family WASHINGTON, DC - JANUARY 20: Donald Trump Jr, with his wife Vanessa and children departs St. John's Church on Inauguration Day on January 20, 2017 in Washington, DC. Donald J. Trump will become the 45th president of the United States today. (Photo by Chris Kleponis - Pool/Getty Images) NEW YORK, NY - NOVEMBER 11: Donald Trump Jr. poses with wife Vanessa Trump and their children at Disney On Ice Presents Frozen at Barclays Center on November 11, 2014 in New York City. (Photo by Jerritt Clark/WireImage) NEW YORK, NY - DECEMBER 11: Donald Trump Jr., wife Vanessa Haydon, and children Kai Madison and Donald John III attend Z100's Jingle Ball 2015 at Madison Square Garden on December 11, 2015 in New York City. (Photo by Craig Barritt/Getty Images for iHeartMedia) Donald Trump Jr,, son of Republican U.S. presidential candidate Donald Trump, talks to his wife Vanessa as they await the arrival of the candidate at DonaldTrump's New York presidential primary night rally in Manhattan, New York, U.S., April 19, 2016. REUTERS/Carlo Allegri Donald Trump, Jr. and his wife Vanessa Trump pose for photographers before the start of the Chaiken 2007 fall collection during New York Fashion Week February 6, 2007. REUTERS/Keith Bedford (UNITED STATES) Donald Trump Jr. (C) jokes around and motions with a large pair of scissors toward the throat of his wife Vanessa Trump (R) while Too Kim Tiah (L) the CEO of TA Global, the owner and developer of Trump International Hotel and Tower Vancouver, looks on during the grand opening of the Trump International Hotel and Tower in Vancouver, British Columbia, Canada February 28, 2017. REUTERS/Nick Didlick TPX IMAGES OF THE DAY Donald Trump Jr. and his wife Vanessa speak with Jared Kushner during inauguration ceremonies for the swearing in of Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington, U.S., January 20, 2017. REUTERS/Brian Snyder WASHINGTON, DC - JANUARY 19: (AFP OUT) Donald Trump, Jr., wife Vanessa and children Donald Trump III and Chloe Sophia Trump arrive at Joint Base Andrews in January 19, 2017 in Maryland. Hundreds of thousands of people are expected tomorrow for the inauguration of Trump Jr.'s father, Donald Trump as 45th president of the United States. (Photo by Chris Kleponis-Pool/Getty Images) BRIARCLIFF MANOR, NY - SEPTEMBER 15: Donald Trump Jr., Vanessa Haydon and child attend The Eric Trump 8th Annual Golf Tournament at Trump National Golf Club Westchester on September 15, 2014 in Briarcliff Manor, New York. (Photo by Dave Kotinsky/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

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