KABUL (AFP) - Three Nato soldiers were killed in Afghanistan on Sunday in separate incidents, the international force said, bringing the number of foreign troops who have died in the war this year to 117. One soldier was killed by gunfire and another by an improvised bomb in the south of the country, Natos International Security Assistance Force said in a statement. The third soldier was killed by gunfire in the east. Nato did not give the precise locations of the killings, or the nationalities of the dead. Southern Afghanistan has seen the worst violence in the Taliban-led insurgency. Last year was the deadliest yet for foreign troops in Afghanistan, with 519 fatalities reported in the conflict. AFPs count of 117 this year is based on a tally kept by the independent icasualties.org website and exceeds the 77 foreign troops killed in the first three months of last year.