Call of Duty is a PC game which simulates a combat situation and when one of the boys' avatars met a particularly bloody demise, he lay on the floor and screamed "help, help, help" at the top of his voice, according to the local Sydsvenskan daily.
The tumult was heard by passers-by who took the cries seriously and rang the police.
A unit was dispatched and within ten minutes the boys, much to their dismay, where looking down the barrels of hand-guns held by the ten-strong police force.
When one of the teenagers opened the door to the apartment in an apparent bid to explain the mix-up, the police officers screamed at the group to put their hands up.
The boys were then told to leave the premises with their hands on their heads and lie flat on the ground.
The situation was however then cleared up shortly after and the boys could return to the safety of their fantasy world.