Three people were shot inside an Uber vehicle, including the driver, when an assailant opened fire on the sport utility vehicle Sunday morning on Interstate 880 in Oakland, prompting investigators to close the freeway for several hours, officials said.

The shooting happened around 4:15 a.m. when “a group of partygoers” in the SUV got onto the southbound lanes of the freeway near 23rd Avenue, California Highway Patrol officials said.