The incident happened in Lumusa Distr-ict where the young girl was grabbed by two men and carried away to another location where she was raped over several hours before being released.
Mark Balati, a reserve policeman in Lumusa who reported the incident to the media, said law and order agents in the district are questioning every young man as a possible suspect after the girl described her attackers through sign language.
"We have some prime suspects and we hope to arrest them and hand them over to Mt Hagen police soon," Mr Balati said.
The reserve policeman said many of the young boys from the area were in Baiyer for a rugby league match when the incident occurred.
According to Mr Balati, the girl was inside a toilet when the two men grabbed her and covered her mouth to stop her from screaming and carried her away. She was reportedly raped for several hours before being released.
Mr Balati said the people of Lumusa are fed up with such crimes and are expected to arrest the suspects and hand them over to the police.