SOUTH SAN FRANCISCO -- Authorities identified the 31-year-old Daly City man killed in a car collision on Interstate 280 Saturday as Heinrich Santos.

Santos died after a 12:20 p.m. crash on the Westborough Boulevard ramp onto the southbound side of the freeway, according to the California Highway Patrol. Police have not said what caused the wreck.

Authorities initially thought there was one crash at the scene, but later learned there was also a hit-and-run collision there. Both incidents remain under investigation.

The crashes left the Westborough exit closed for two hours while police worked at the scene.

Contact Joshua Melvin at 650-348-4335. Follow him at Twitter.com/melvinreport.