The initial scene of the shooting in the Portola district (CBS)

SAN FRANCISCO (CBS SF) — San Francisco police are investigating a shooting that began on San Francisco streets before moving to Highway 101 near Millbrae, police said.

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At around 5:35 p.m. Monday evening, SFPD officers responded to southbound Highway 101, near the Millbrae off-ramp, to meet with a California Highway Patrol unit that responded to a shooting call, SFPD officer Rueca said. CHP found a vehicle pulled over on the shoulder and discovered that the person sitting inside was a shooting victim, who had been shot earlier in San Francisco.

The victim was shot at Sweeny St. and Barneveld Ave. in the city’s Portola district, police said.

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Police said they were conducting a preliminary investigation and did not know the status of the victim on Monday evening.

The victim’s vehicle was towed to a police station.

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No other details were immediately available.