Police are investigating a break-in at a Pembroke grocery store in the early hours of Saturday.A police spokesman said that police received a call that an alarm at Arnold’s Supermarket on St John’s Road had been triggered just before 2.30am.The spokesman said: “A short time later, a member of the public called to report hearing a loud bang at the rear of the premises and that they had seen four males run off. “Patrol units arrived within minutes and effected a search of the area, however the suspects were not found.”The spokesman did not say if anything had been stolen.• Anyone with information is asked to contact the Serious Crime Unit on 247-1739 or the independent and confidential Crime Stoppers number, 800-8477