Dadu: Four laborers working at mines of coal mines Lakhra died during excavation of coals from mines. The ropes of a tractor was broken during work, killing laborers in mines. According to SSP Jamshoro Anwar Khetran, through lift machine, the rescue team has taken out dead bodies of laborers from mines of coals. He said that laborers were working at mines of coals as the ropes were broken during the mining process. He said that this incident had occurred at coal mines no 39 and further investigation has been started. The four laborers who have died in the incident have been identified as Sami Rehman, Akhtar, Taj Mohammad and Kalram residents of Sawat.