Workers stand outside a collapsed coal mine in Pir Ismail, Marwar area near Quetta, the provincial capital of Balochistan, southwestern Pakistan, on May 5, 2018. At least 18 people were killed, 13 others injured and about a dozen went missing as two coal mines collapsed in different areas of Pakistan's southwest province of Balochistan on Saturday, local media reported. (Xinhua/Irfan)