Four Italian NATO soldiers have been killed in an insurgent attack in western Afghanistan. The Italian army said the soldiers were killed in an ambush in the Gulistan Valley in the western province of Farah as they were returning from a mission. The army said another soldier was wounded in the incident. The deaths brought the number of Italian soldiers killed in Afghanistan in the last six years to 34, of whom 21 have lost their lives in the past two years. Italy has about 3,400 soldiers in Afghanistan, with the deployment set to grow to 4,000 by the end of the year.