The Achingmori incident refers to an event in the year 1953 when a group of Daphla tribals of the Tagin people killed 47 members of an Indian government party including personnel of the Assam Rifles and tribal porters during an administrative tour in Achingmori in present-day Arunachal Pradesh. Apart from tribal rivalries and unfollowed security protocols, the massacre was also attributed to a rumour that the government party was there to free slaves. A village priest had also confirmed this through an omen. The tribal leaders who were guilty were jailed for three to four years. This was considered as too short a period by the Galong tribals who were also victims in the massacre. They in turn killed one of the leaders behind the massacre.