After the store closed Thursday evening, officers responded to a report from a caller who saw two men inside the store with flashlights.
MORE: Video shows dozens of people ransacking store at Oakland gas station
Officers observed the suspects -- both wearing Halloween masks -- pushing shopping carts full of costumes across Somerville Road. The store is located at 2520 Somersville Road.
After detaining the men, security footage confirmed their involvement in the break-in.
A search revealed that the suspects were carrying ammunition, and one had prior felony convictions.
Both were arrested on suspicion of burglary and unlawful possession of ammunition and were taken to county jail.