All six shooting victims were taken to hospitals, CHP spokesman Steve Loftus said. Details on their conditions were not immediately available.

The shooting took place shortly before 1:30 a.m. in the Grapevine area, on Interstate 5 near Fort Tejon Road, Loftus said.

The bus was carrying about 40 passengers.

A suspect is in custody, Loftus said. Authorities have not detailed what the motive may be.

Correction: An earlier version of this story misstated the day the shooting occurred. It happened early Monday.