The US army provided counter-insurgency training to Nigerian troops battling a rise in attacks by Islamist militants, the Nigerian military has revealed. More than 100 people have been killed in recent days by the radical Muslim sect Boko Haram, dubbed the 'Nigerian Taliban', in Nigeria's north-east. Nigeria has sought to crush the group with military force but faces criticism from human rights activists for alleged extra-judicial killings. The military said some battalions had received training in the US.