LYNN – Police are investigating a string of vandalism incidents in and around Atlantic Avenue over the weekend, police said.According to police, nine cars on Atlantic Avenue, Chestnut Street and Lewis Street were scratched along the length of the vehicles with a sharp object, possibly a key.The vandalism occurred early Sunday morning.Police are investigating another incident that was reported at about 8 a.m. Monday on Atlantic Avenue that might be related, police said.- Dan O’Brien