UPDATE [2/12/17, 4:48 p.m. EST]:

Donald Trump Jr. confirmed on Twitter that his wife, Vanessa Trump and their children are “safe and unharmed after the incredibly scary situation that occurred this morning.”

The president's eldest son also called out the “truly disgusting” individuals who expressed their “opposing views with such disturbing behavior.”

President Donald Trump's daughter-in-law was taken to the hospital on Monday after opening a letter containing an unidentified substance, according to reports.

Vanessa Trump reportedly opened a letter around 10 a.m. ET that was addressed to her husband, Donald Trump Jr., at their Manhattan apartment, according to NBC News. After it was opened, three people at the residence were taken to New York Presbyterian-Weill Cornell Medical Center.

Officials say there is no indication anyone suffered any injuries and that the trip to the hospital was only a precautionary measure.

Preliminary tests on the substance conducted at the scene deemed it nonhazardous, according to the NYPD.

President Trump's personal attorney, Michael Cohen, said in a statement: "How disturbed must a person be to do what they did to a mother of five children?''

“This dangerous and reckless act goes beyond political differences.”