A person was killed Sunday morning when a pickup rear-ended a big rig and caught fire on the 210 Freeway in Pasadena, authorities said.

The crash occurred at 4:15 a.m. on the westbound freeway near the Fair Oaks Avenue off-ramp, according to the California Highway Patrol.

A representative from the Los Angeles Office of Medical Examiner was called to the location at 4:34 a.m.

A SigAlert issued at 4:31 a.m. closing the transition road from the westbound 210 Freeway to the 134 Freeway was canceled at 9:46 a.m.

No further information was immediately available.