About 60 police officers from Garden Grove and Santa Ana arrested three gang members believed to have killed two people and wounded six others in the worst gang-related incident in Orange County history. The officers swooped down on seven houses in Santa Ana as well as a warehouse, a home and a construction site in Riverside. Three gang members, including two men suspected of firing into a crowd of 13 people outside a Garden Grove home on Sept. 16, were arrested on suspicion of murder, conspiracy to commit murder, attempted murder and acts involving gang activity, police said. One of those arrested is a 14-year-old Santa Ana boy, investigators said. A fourth murder suspect called his parole office to say he would surrender, officers said. A fifth gang member, Randy Martinez, was arrested after guns were found at his Santa Ana home.