SOUTH GLENS FALLS, N.Y. — Exotic dancers performed lap dances on teenagers at a boy’s surprise 16th birthday party in an upstate New York village, police said, and investigators were trying to determine whether any organizer of the celebration committed a crime.

South Glens Falls Police Chief Kevin Judd said the investigation began after people concerned about the Nov. 3 party at a bowling alley told authorities about racy photos that had been posted on social networking sites.