Officials say German Chancellor Angela Merkel has called Afghan President Hamid Karzai to express her condolences following the accidental killing of six Afghan soldiers by the German military, according to AP. A government spokesman in Berlin _ speaking on customary condition of anonymity _ said on Saturday that Karzai thanked Merkel for her call and expressed his sympathy regarding the deaths of three German soldiers in Afghanistan. German soldiers on Friday were attacked by militants near the northern city of Kunduz. An almost 11 hours long battle ensued, which left the three German soldiers dead. German troops rushing to the scene of the fighting after nightfall then killed six Afghan troops when they mistook them for insurgents, the Afghan Defense Ministry said.