DULUTH, MN (KDAL) - Vandals caused damage at the Chester Bowl Chalet early Monday morning.  Police were called around midnight when one of the live-in caretakers reported a disturbance.  Several windows had been smashed out by rocks, tires were slashed on a vehicle and two lights were also broken.  Earlier in the evening, the caretaker had a run-in with four juveniles who appeared to have been drinking.  They were asked to leave the park but threatened to return.  Duluth Police are investigating the incident.