Suspected Taleban militants have killed a school headmaster and a district chief in southern Afghanistan, officials say. The headmaster was shot by suspected insurgents on a motorbike in Kandahar's Panjwayi district on Tuesday, the interior ministry said. The head of the province's Arghandab district was shot dead in a mosque on Tuesday evening, it said. More than 1,200 people have died in violence linked to militants this year. Interior Ministry spokesman, Yousuf Stanekzai, confirmed the killings. It was immediately clear why the pair were targeted but the Taleban have killed several prominent government and religious leaders who have spoken out against the rebels. Taleban officials could not be reached for comment. Correspondents say the attack on the school teacher may have been motivated by the Taleban's opposition to Afghans sending their children to secular government schools instead of Islamic seminaries.