LOS ANGELES, CA —Twenty-five people were hospitalized — some with serious injuries — when a bus rolled over on the Santa Monica (10) Freeway in downtown Los Angeles Saturday.

The bus had 32 passengers at about 4 a.m. when it struck a sand-filled attenuators on the westbound Santa Monica (10) Freeway at the Harbor (110) Freeway connector. Then it hit a concrete bridge abutment going onto the edge of the bridge railing and overturning onto its driver side, the California Highway Patrol reported.

Four people had to be rushed to the hospital in serious condition, and another 21 were hospitalized in fair to good condition, according to Amy Bastman of the Los Angeles Fire Department. Most passengers walked from the bus and seven refused treatment, she said.