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Gunmen have set fire to at least 55 fuel tankers and killed a driver in two separate attacks on NATO convoys taking supplies to coalition forces in Afghanistan. The strikes in southwestern Pakistan are the latest in the string of attacks since the country closed a key border crossing point almost a week ago after a NATO helicopter attack in the border area, which killed three Pakistani troops. The closure of Torkham crossing has left hundreds of trucks stranded alongside the country's highways.