A big rig overturned Sunday on a Riverside (91) Freeway connector Sunday, prompting a road closure.

The crash was reported at about 8:45 a.m. on the eastbound 91 connector to the westbound Pomona (60) Freeway in Riverside, according to the California Highway Patrol.

It was unclear if anyone was injured in the crash, but a caller told the CHP that all occupants made it out of the truck before first responders arrived.

A Sigalert was issued and the connector was closed while a tow truck was called to haul the disabled vehicle away, according to Caltrans.

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