KABUL: Four NATO soldiers have been killed in bomb blasts in southern Afghanistan, the International Security Assistance Force (ISAF) said on Sunday. The soldiers died “following separate improvised explosive device (IDE) attacks” on Saturday, the ISAF said in a statement. The force did not provide further details or the nationalities of the victims. The latest deaths take the toll among NATO troops in Afghanistan this year to 169 and the total in 10 years of war to 3,016, according to an AFP count based on records kept by icasualties.org. The Taliban have stepped up their attacks across the country since announcing the start of their spring offensive at the beginning of May.