NEW : NATO said the attacker struck as forces were walking toward a park . Journalist Ruhullah Khapalwak in Kabul contributed to this report . 20 Afghans dead , Six were wounded , the provincial governor said . Three Afghans troops were wounded , the governor said . The attack took place in a Maymana market .
NEW : NATO said the attacker struck as forces were walking toward a park . 20 Afghans dead , Six were wounded , the provincial governor said . Three Afghans troops were wounded , the governor said . The attack took place in a Maymana market .