(07-09) 09:59 PDT OAKLAND -- Law-enforcement officers arrested 83 people during Thursday night's protests in downtown Oakland over the involuntary manslaughter conviction of former BART police Officer Johannes Mehserle for the shooting death of train rider Oscar Grant, police said today. The rallies began peacefully but soon degenerated into lawlessness, during which protesters looted businesses, sprayed anti-police graffiti on storefronts, set trash bins on fire and clashed with police wearing gas masks and riot helmets and carrying batons, authorities said. Police from agencies throughout the Bay Area were called in to help Oakland officers. Those arrested were booked on suspicion...