Police officials in Gothenburg said the nine officers, all of whom were male, were celebrating at a cabin near Gothenburg after completing supplemental training to serve in special tactical units, Swedish news agency TT reported Monday.
"These are officers with several years of experience. They are between 30 and 40-years-old," said Erik Nord, commander of field duty police officers in Gothenburg.
Nord said a game played at the party involved taking pictures of the officers' nude bodies while holding police-issued sub-machine guns. A male stripper was also in attendance at the party, Nord said.
He said none of the activities at the party were illegal, but they were "inappropriate" and "not acceptable."
"It shows a complete lack of judgment. You can't do what you want when you're off-duty and a policeman," said Nord.
He said the officers are on desk duty while an investigation is carried out.