Gunmen ambushed two teenage brothers as they returned home from doing laundry, shooting and killing a 16-year-old boy and injuring his brother, police said. Antonio Nunez Jr. was killed instantly and his brother was hit in the hip during the attack around 11 p.m. Friday, police said. The boys' 39-year-old uncle, who was visiting their mother, also was shot. The boys appear to be good kids who attended Mass with their mother earlier Friday evening, said Oakland Police Sgt. Jim Rullamas. "As far as we know they didn't do anything to provoke this," Rullamas said.