The San Francisco police and fire departments are investigating the Monday morning arson of two vehicles in the city’s Mission district.

No one was injured when two unoccupied vehicles were set on fire in the 3400 block of 18th Street near Mission Street, police said.

At 12:08 a.m. Monday, several people called the San Francisco Fire Department and reported the two burning cars, spokeswoman Lt. Mindy Talmadge said.

Respondents arrived at 12:11 a.m. to find the two vehicles still burning, but they extinguished the blazes within minutes, Talmadge said. An arson investigator was called for at 12:18 a.m.

A witness told police officers at the scene that she had seen three people running away from the burning vehicles but that she did not see them light any fires.

The witness described the suspects as three white men in their early 20s, police said. No arrests have been made.

Talmadge said she is not aware of any other recent vehicle arsons in the area.

The case is being investigated by the city’s Arson Task Force, a joint effort by the San Francisco police and fire departments, police Sgt. Troy Dangerfield said.

Anyone with information about the vehicle arsons is encouraged to call the San Francisco Police Department at (415) 553-8090.

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