An airstrike Thursday killed 10 Afghan workers parliamentary election campaign workers, Reuters reports. NATO says it’s investigating the incident, which happened in the more peaceful northern part of the country, near Tajikistan, in Takhar province. Candidate Abdul Wahid and several of his staffers were wounded in the strike, carried out by two helicopters and two planes of some sort, the provincial governor said. There are no foreign troops stationed in Takhar. Afghanistan’s parliamentary elections will be held September 18 and will test the country’s political stability.