At least 40 people - most believed to be female students - have been killed in a bomb attack on a school in west Kabul, according to Afghan government officials. At least 50 are also reported to have been injured by the blast, which happened in the Shia-majority neighbourhood of Dasht-i-Barchi. Taliban spokesman Zabihullah Mujahid denied involvement and condemned the incident. He said only Islamic State group could be behind such an atrocity.