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Authorities say a gunman opened fire during a large house party in central California, injuring seven people.

The California Highway Patrol said officers were conducting a traffic stop shortly after midnight in Manteca when they heard several gunshots and saw people running for their lives.

Officers who went to the house learned that a man armed with a semi-automatic weapon showed up to the party and began shooting into the crowd.  

Two of the injured were critically hurt; five others were treated and released from the hospital.

No arrest has been made and the suspect’s identity and the motive for the attack have not been released.