The trial of a British security contractor charged with killing two of his colleagues last year opened Wednesday in Baghdad with testimony from a guard who said the contractor shot him. Danny Fitzsimons…is the first Western contractor on trial in an Iraqi court since a 2009 U.S.-Iraqi security agreement lifted immunity for foreign contractors…Fitzsimons is charged with two counts of premeditated murder in the deaths of two contractors…Arkan Mahdi Saleh, an Iraqi guard at the security firm ArmorGroup that also employed the defendant and the two slain men, told a three-judge panel that he saw Fitzsimons with a pistol before he was shot. [also refers to Blackwater (now Xe)]