(Reuters) - German Development Minister Gerd Mueller accused Qatar on Wednesday of financing Islamic State militants who have seized wide areas of northern Iraq and have posted a video of a captive American journalist being beheaded. "This kind of conflict, this kind of a crisis always has a history ... The ISIS troops, the weapons - these are lost sons, with some of them from Iraq," Mueller told German public broadcaster ZDF. "You have to ask who is arming, who is financing ISIS troops. The keyword there is Qatar - and how do we deal with these people and states...