At least nine people have been killed in a suicide bomb attack on a Shia mosque in Baghdad, Iraqi officials say. The attacker detonated his explosive vest during noon prayers in the south-eastern area of New Baghdad. It comes days after Shia militiamen were accused of killing some 70 people at a Sunni mosque to the north-east. Sectarian tensions in Iraq have been heightened by the seizure of large swathes of the country by Islamic State (IS) militants and allied Sunni rebels. They are believed to have hindered efforts by prime minister-designate Haider al-Abadi to form a new unity government. At his first news conference since accepting the nomination, Mr Abadi said he was worried about the heavily armed Shia militiamen mobilised by his predecessor roaming the streets of Iraq unsupervised.