Four coal mine workers were killed and one wounded in accidents in Turkey's northwestern province of Zonguldak on Friday. Local Dogan news agency reported that three workers aged 24, 53 and 54 were killed due to a coal gas leak at an unlicensed coal mine. The workers were reportedly working at the mine for 60 Turkish Liras (about 30 U.S. dollars) per day. In addition, one worker was killed and another one was wounded in an accident at a mine administered by the Turkish Hard Coal Institute because they fell from the locomotive while working 260 meters under the ground. The workers were immediately taken to nearby hospitals and investigations into both incidents are underway.