Fifty-seven suspected gang members were arrested after a yearlong investigation into the death of a CHP officer who was shot by a 16-year-old boy outside a courthouse, authorites said Monday. Investigators from local, state and federal agencies began arresting the suspected members of the Pomona 12th Street Sharkies gang Friday on charges ranging from conspiracy to commit murder to weapons and drug-related violations, California Attorney General Bill Lockyer said in a statement. Authorities used wiretaps, informants, surveillance and undercover agents during the investigation to obtain evidence against alleged gang leaders. Authorities seized dozens of weapons, more than $43,000 in cash,...