While on patrol in the 3400 block of University Avenue, I saw the suspect run out of the 7-11 located at 3516 University Avenue with a case of beer.I observed the store manager running after the suspect headed eastbound on University Avenue. I made contact with the manager who stated that the suspect attempted to purchase alcohol without sufficient identification.According to the store manager, the suspect ran out of the store after the manager asked him to return the alcohol to the cooler. I contacted dispatch for another unit and drove eastbound on University Avenue. I found the suspect hiding behind a dumpster in the south east alley way. Because I had reasonable cause to believe the suspect might be armed, I directed him to exit the dumpster