Gang activity was blamed for a riot that broke out last week at the jail in Placerville, police said.El Dorado County sheriff's Sgt. Bryan Golmitz said about 10 inmates began fighting among themselves at 2 p.m. Oct. 8. Some inmates suffered minor injuries.Golmitz said the prisoners ignored orders from jail staff to stop fighting.A staff member used a Taser on one prisoner who continued to brawl with another inmate, Golmitz added.Guards eventually regained control and injured inmates received medical care.No jail staff members were hurt.