By Pete Young and KTVU staff
The car was traveling on Jackson Street, between Stockton and Grant, about 9:25 p.m. when it was surrounded by about 10 to 15 people. Lt. Mariano Elias said.
A "crowd surrounded and vandalized the vehicle, breaking the window and throwing a firework inside, which set the vehicle on fire," said Sandy Karp, a Waymo spokesperson.
The car was not transporting any passengers and no injuries were reported, Karp said.
"We are working closely with local safety officials to respond to the situation," Karp said.
On Sunday, San Francisco Fire Department issued a social media post that said use of fireworks is prohibited in San Francisco.