By Brian Park

This story was updated at 3 p.m.

Traffic is still moving slowly but the California Highway Patrol has reopened all lanes on Interstate 5 just south of San Clemente where a big rig caught fire Wednesday morning.

The fire began around 10 a.m. on Wednesday near the San Clemente Border Patrol checkpoint, said Officer Tommy Doerr, media information officer for the CHP in San Diego County.

Lanes were reopened around 2:40 p.m., according to the CHP traffic incident information page.

All lanes of the freeway were initially shut down. The northbound left lane and the two left southbound lanes were reopened around 10:30 a.m., Doerr said. All southbound lanes were briefly reopened around 11 a.m. but were closed again after the fire restarted and jumped lanes 20 minutes later. Fire crews from Camp Pendleton worked to clear the scene and lanes were gradually reopened.

Officials are unsure how the fire began or when the scene will be cleared.

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