PACOIMA (CBSLA.com) — Two people were injured, one seriously, in a multi-vehicle collision in Pacoima Monday afternoon.

The accident, which involved a trash truck, a minivan, a big rig and a school bus—with no students aboard—happened around 4:45 p.m. on the southbound 5 Freeway north of Osborne Street.

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The big rig blew a tire and hit a retaining wall, according to the California Highway Patrol.

The victims did not want to be taken to the hospital.

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Three lanes were closed on the southbound side of the highway in a SigAlert.

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Traffic was backed up for about a mile, reaching back to the 118 Freeway.