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SAN DIEGO — A 38-year-old man, possibly under the influence of alcohol, suffered a serious head injury Saturday when he fell off his motorized scooter in the Rancho Penasquitos section of San Diego.

The crash in the 12600 block of Darkwood Road occurred at 2:34 a.m., said San Diego police officer Frank Cali.

Paramedics rushed the man to an area hospital, Cali said.