Washington D.C. police are checking into an unknown “white substance” that was reportedly mailed to former President Barack Obama’s capital office, according to the New York Post. The incident was recorded on Tuesday around 12:30 p.m. at the World Wildlife Fund Headquarters. Obama leased an office in the building after leaving the White House in Jan. 2017.

D.C. Fire and EMS Battalion Chief Edward Smith told FOX 5 that a letter arrived at the office from Hong Kong, and reportedly held baby powder. There was no return address. D.C. police, fire crews, the FBI, and Secret Service all responded to the call.

On Monday, Donald Trump Jr.’s wife Vanessa Trump, her mother, and a third unidentified person were hospitalized in New York as a precaution after receiving an envelope that also contained a white powder. A letter was included along with the substance, which, according to the New York Post, was quite “threatening,” and called Trump Jr. a “terrible person.” The envelope had a Boston post mark, and the powder turned out to be harmless cornstarch.

Trump Jr. took to Twitter to express his gratitude to law enforcement.

However, what really matters in this situation is the safety of the Obamas. Even though they’re no longer in the White House, it’s still protect Barack and Michelle at all costs.