At least 31 Taliban militants, including a key commander, were killed and 30 others injured as military aircraft pounded militants' hideouts in Afghanistan's Helmand province on Sunday, an army spokesman said."Afghan air force backed by the NATO-led resolute support mission launched series of air-strikes against Taliban hideouts in Musa Kala district. As a result, 31 rebels, including a key commander Mullah Zarqawi, were killed and 30 were injured," Xinhua quoted Brig Mohammad Rasoul Zazai as saying.The air-strikes took place amid Taliban preparations to capture Musa Kala district.Taliban militants have infiltrated Musa Kala district over the past several months and were poised to launch a major offensive to capture the south Afghan district.