SANTA MONICA, Calif. (AP) — Police are looking for gunmen who shot up a party bus in Santa Monica, killing a passenger.

Police say two unrelated party buses were parked near the Santa Monica Pier at around 1 a.m. Saturday when a group from one bus got into an argument with a group from the other bus.

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Police say two or three men opened fire on the other bus, hitting several people inside, then ran off.

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The driver drove the bus to the police station.

One person was treated at the scene for minor injuries and three others were taken to a hospital, where a woman in her 30s died and the other two victims are in stable condition.

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No arrests have been made but police say four guns were found.