At least six soldiers with the Afghan National Armydied after breathing carbon monoxide from diesel-powered heaters in eastern Afghanistan, dpa quoted an official as saying Thursday."The incident occurred in Sahrabagh military base (in Khost province)on Wednesday night while the soldiers were asleep," provincial deputygovernor Abdul Wahed Pathan said. The soldiers died on their way to hospital, he said, adding therwere no signs that insurgents were behind the incident.Afghans mostly use coal and diesel heaters in the cold winter