At least 10 Nigerian soldiers have been killed and nine severely injured in an ambush by jihadists in restive northeast Nigeria, military sources said yesterday.<br />''<br />''Another 12 soldiers were missing after a column of troops on patrol was ambushed by the fighters yesterday in Damboa district of Borno state.<br />''<br />''Fighters loyal to the Islamic State group claimed responsibility for the killings, but said they had slain 22 soldiers after an assault by the army.<br />''<span style="color: #222222;"><br />''A decade-long jihadist insurgency in northeast Nigeria has killed 35,000 people, displaced two million others and spilt into neighbouring countries.</span><br />