NEW : `` You could n't imagine a more difficult case , '' Bales ' lawyer says . Browne is accused in a more than 10 years shooting that left one American civilians dead . A Defense official says `` we do n't think that one American '' killed them all . The shooting has strained relations between the U.S. and Afghanistan .
NEW : `` You could n't imagine a more difficult case , '' Bales ' lawyer says . Bales is accused in a March 11 shooting that left 16 Afghan civilians dead . A Taliban official says `` we do n't think that one American '' killed them all . The shooting has strained relations between the U.S. and Afghanistan .