PACOIMA (CBSLA.com) — Authorities say one person was killed when a vehicle overturned in Pacoima on Saturday.

The crash was reported just before 5:30 p.m. on Laurel Canyon Boulevard, where one woman was pronounced dead.

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Firefighters said another woman was taken to the hospital and is in grave condition.

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The CHP believes the car may have flipped over an interchange between the 118 and 5 Freeways.

A SIG Alert was issued just before 6 p.m. affecting the northbound 5 and the eastbound 118.

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The cause of the crash remains under investigation.