At least 10 vehicles were sidelined with blown or flat tires during Monday-morning rush hour in Los Angeles, causing mass congestion.

The southbound 405 Freeway in Encino was backed up from 5:30 a.m. near Mulholland Drive, according to the California Highway Patrol’s traffic log.

Officials said metal rods or similar debris in the roadway may have caused the tire damage. Multiple drivers were forced onto the right shoulder after their vehicles became disabled.

Footage from AIR7 showed roughly 10 cars stopped along the shoulder, with several appearing to have suffered flat tires.

Although the incident resulted in only one lane being shut down, the volume of rush-hour traffic caused substantial backups through the area.

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