The shooting was reported around noon near East Fork Road, just north of the San Gabriel Reservoir, according to the Los Angeles County Sheriff's Department.
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No one was reported struck by the gunfire, which prompted a massive law enforcement response from deputies on the ground and three sheriff's helicopters above the scene.
A search for the gunman ensued and Glendora Mountain Road was closed in the area as the investigation continued.
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Shortly before 1 p.m., two deputies who had been lowered to the ground from one of the helicopters detained a suspect. Details about the person in custody were not immediately disclosed.