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Police in the Northern California city of Tracy said an alleged shooter has been hospitalized after killing two people and wounding a third in a residential neighborhood early Thursday.

The Tracy Police Department said on Facebook that the suspect is in critical condition from what appears to be a self-inflicted gunshot injury. The remaining victim was treated and released.

“It appears that it was a one-person event. There is no danger to the area. We believe that the person who was responsible is at the hospital,” Tracy Police Department spokesman Tony Sheneman told KOVR-TV in Sacramento.

Police said they received multiple 911 calls shortly before 3 a.m. They say the suspect was known to the victims.

The shooting occurred at the Green Oaks Mobile Home Park shortly before 3 a.m. Tracy is a city of about 90,000 people about 60 miles east of San Francisco.