Manus Provincial Police Commander, Chief Inspector David Yapu, said campaigns should be conducted without threats, intimidation or any form of violence.
He said police will come down hard on those who use violence during the campaign period.
PPC Yapu made the appeal after there were reports of a gunshot being heard during an election campaign in one of the villages on the mainland.
He said police are now investigating the incident, which took place at Kapou village, in the Penabu Nalisopat LLG.
A complete report will be made soon.