Haflong, May 3: According to sources, there was heavy exchange of fire on Tuesday near Khangnam and Dauban villages at the tri-juncture of Assam, Manipur and Nagaland under Mahur Police station of Dima Hasao district. On receiving the information, a team of 37 Assam Rifles rushed to the spot but the insurgents managed to flee before the team reached the place, sources said. The firing was suspected to have taken place during a clash between members of Zeme United Front (ZUF) chairman group and ZUF chief group. In the incident, two insurgents were killed. A team is investigating the reason behind the clash.