Boxes of french fries covered parts of a Los Angeles freeway on Grant PrestonThursday morning, causing lanes to be blocked for hours, according to authorities and reports.

The crash occurred around 3:19 a.m. PT on Interstate-5 southbound, California Highway Patrol's Southern Division shared in an X post. Initially, the CHP predicted the crash would take around two hours to clean up, but the affected lanes remained blocked until 9:30 a.m. PT, according to a news release by the police agency.

The long clean-up was due to several boxes of french fries and diesel fuel covering the lanes, KTLA 5 reported. Piles of french fry boxes were left all over the freeway, according to the Los Angeles-based TV station.

How did the crash happen?

When CHP responded to the accident after receiving a 911 call, officers determined the driver of a semi-truck made an "unsafe turning movement" for an "unknown reason" causing the vehicle's front to hit an impact collision attenuator, the news release says.

The collision caused the semi-truck's trailer to detach and spill its "load and diesel fuel onto the roadway," according to CHP.

Although CHP did not confirm if the truck was carrying fries, the police agency did say that the crash involved "hazardous materials" and the California Department of Transportation responded to cleanup.