What is believed to be cocaine prompted a brief evacuation of the White House over the weekend.
The complex was evacuated around 8.45pm on Sunday (local time) after the US Secret Service discovered the suspicious powder in a common area of the West Wing.
A preliminary test showed the substance was cocaine, two officials told the AP. It was found in an area accessible to tour groups, not in any particular West Wing office, they said.
US President Joe Biden was away at Camp David, the presidential country retreat, when the substance was found.
US Secret Service spokesman Anthony Guglielmi told the Washington Post that there is “an investigation into the cause and manner” of how the substance entered the White House.