BAGHDAD, Iraq - Two former Iraqi commanders denied gassing Kurdish civilians in northern Iraq 20 years ago, telling Saddam Hussein's genocide trial Thursday that they used only conventional weapons against Kurdish rebels and Iranian troops. Sultan al-Tai, minister of defense under Saddam, and Gen. Hussein Mohammed, a deputy director of army operations, testified to rebut evidence presented by prosecutors in videos and documents this week. The documents, prosecutors said, showed Saddam's government sanctioned the use of "special weapons" — mustard or nerve agent — against Kurdish civilians as well as rebel fighters in 1987-88. In sometimes emotional testimony, al-Tai alleged...