Four people were shot early Thursday in Washington, D.C., within walking distance of the White House.

The shooting occurred at about 8 a.m. at the Vida Gym in the city's upscale Logan Circle neighborhood, about a mile from the White House. Police described the location as an "active" scene, with the shooter still inside the gym.

The city's Metropolitan Police Department issues a shelter-in-place warning to residents on their cellular devices.

The incident has resulted in a massive law enforcement response, with the National Guard and numerous federal agencies at the scene. Helicopters are above the crime and police snipers are on roofs. 

Authorities have asked people to avoid the area near the 1500 block of 15th Street, crossing P Street, which has been cordoned off. The area includes St. Luke’s Episcopal Church, a Whole Foods supermarket and residences.

The DC Metro Police Department's Emergency Response Team has responded to the shooting.