ISLAMABAD, Sept. 8 (Xinhua) -- At least four laborers were killed and two others fall unconscious due to the accumulation of poisonous gas in coal mine in Pakistan's southwestern Balochistan Province on Friday, local Urdu media reported.
The laborers were working thousands of feet deep down the mine when the poisonous gas leaked and accumulated, suffocating the laborers to death, Dawn News said.
The incident happened in Sanjidi coal mine located some 45 km away from the provincial capital of Quetta.
The injured laborers were shifted to a nearby hospital where they are said to be in critical condition.
Coal mines in the province are notorious for their unsafe working conditions.
Accidents often happen in the mines as laborers are not provided with modern equipment to ensure their safety.
Earlier in April this year, four laborers were killed in another range of coal mine in Quetta when the mine they were working caved in.
