In Pakistan, gunmen have opened fire on a Nato convoy near the Pakistani capital, Islamabad, killing at least six people and injuring four others and setting several vehicles on fire. <br/><br/>The assault took place today outside the city in Tarnol areal. The Nato trucks were carrying supplies to alliance troops in Afghanistan. Kalim Iman, inspector general of Islamabad police, said that police were searching for the suspected militants, who escaped in two cars and on motorbikes. <br/>