At least 16 people have been killed and three were wounded in armed clashes triggered by a dispute over the ownership of a coal mine in northwestern Pakistan, police said. The gunfight between the Sunni Khel and Zarghoon Khel tribes occurred in Dara Adam Khel, a district of the Khyber Pakhtunkhwa Province that contains the region's largest coal deposits, police spokesman Fazal Naeem told RFE/RL. The fighting started as the two tribes gathered to try and settle the decades-long dispute. Coal mining is an essential source of income for people living in the district. To read the original story by RFE/RL's Radio Mashaal, click here.