Police Activity on Old Canyon Road

Report of ten people in a fight and one may have a gun.  Numerous officers are on the way to 700 block of Old Canyon Road.  Officers are arriving on scene and this is in the picnic area of the Alameda Creek Trail off of Old Canyon.  No active fights, but 4-5 groups of people.  Officers trying to sort out the details.  One group has taken off on foot.  There was talk of a gun but none seen.  Crime so far is assault.  Officers are patrolling the area now leaving just a few at the scene.  East Bay Regional Park Police called in as this is their jurisdiction.