The Afghan government said 18 insurgent fighters have been killed in a joint operation between Afghan and international forces in southern Helmand region. The Interior Ministry said in a statement Tuesday that six militants were also arrested during the operation a day earlier led by Afghan police, soldiers and intelligence agents backed by NATO forces in Helmand's Sangin district. Separately, deputy provincial police chief Fazel Ahmad Sherzad said an Afghan man was killed and a woman was wounded after insurgents attacked a house Monday in the Shah Wali Kot district of neighboring Kandahar province.