Washington ( CNN ) -- A crew member aboard a U.S. Navy ship accidentally fired a machine gun into the Polish port city of Gdynia on Wednesday while cleaning the weapon , Navy officials said Friday . Three rounds were fired from an M240 machine gun into the town but no injuries or damage were reported , officials said . The gun , aboard the USS Ramage , a Navy destroyer , is used to defend the ship in close combat . Navy officials said a crew member was cleaning the weapon when it accidentally discharged . The incident happened as the ship was in port after returning from an international exercise in the Baltic Sea . It was preparing to leave later that day , the Navy said . Polish military police boarded the ship to investigate , and Navy officials said the crew of the Ramage fully cooperated . No U.S. sailors were taken into custody by Polish authorities , Navy officials said . There was no immediate word of a U.S. Navy investigation into the incident .
Crew member cleaning a machine gun that fires into city of Gdynia . The crew members are all Polish and the weapons were made in Poland. Gun is used to defend ship , USS Ramage , in close combat .