Secret Service test confirms cocaine found at White House ...

A U.S. Secret Service spokesman on Wednesday confirmed that testing shows it was cocaine found in the White House West Wing Sunday evening.

The investigation into how it got there is ongoing.

The white powder was found during a routine search, a source said.

A preliminary field test had showed the substance tested positive for cocaine, sources said.

The cocaine was found on the ground floor of the White House, near the West Executive entrance where visitors are instructed to typically drop off their cell phones when visiting the White House, according to a source familiar with the matter.

Some visitors are able to tour parts of the West Wing, and tours typically take place on the weekends.

When asked if there were tours this past weekend, the Secret Service would not confirm that, saying: "These are details that are pertinent to our investigation and not something we can get into."

President Joe Biden and family members were at Camp David at the time.

The White House has referred questions about the matter to the Secret Service.

ABC News' Molly Nagle contributed to this report.