A Nato jet blasted two fuel tankers hijacked by the Taliban in northern Afghanistan today, setting off a huge fireball that killed up to 90 people, including dozens of civilians, Afghan officials said. The Nato command said a ``large number of insurgents'' were killed or injured in the pre-dawn attack near the village of Omar Khel in the once-calm province of Kunduz. In Brussels, the alliance's chief said it was possible civilians died. Kunduz Gov Mohammad Omar said 90 people were killed. A senior Afghan police officer said that included about 40 civilians who were siphoning fuel from the trucks. The airstrike is likely to intensify concern over civilian casualties in the Afghan war.