Kabul , Afghanistan ( CNN ) -- Ten girls were killed in eastern Afghanistan on Monday when a landmine exploded as they were out collecting firewood -- the latest casualties in one of the most mined countries in the world . Two other girls were injured in the incident in Nangarhar province , said Ahmad Zia Abdulzai , the spokesman for the province 's governor . Landmines -- those planted by insurgents and those left over from the Soviet occupation -- continue to kill dozens of Afghans every year . `` Naturally curious , children are likely to pick up strange objects , such as the infamous toy-like 'butterfly ' mines that Soviet forces spread by the millions in Afghanistan , '' according to UNICEF . Read more : The low-tech , high-design tumbleweed minesweeper designed by former Afghan refugee .
Two others are injured in the blast . Landmines continue to kill dozens in Afghanistan .