THE US military was investigating today the 'likely' discovery of mustard gas near the central Iraqi city of Najaf after five soldiers developed blisters while on duty there, officers said. The soldiers, from the 101st Airborne Division's 1st Brigade, suffered nausea as well as the blisters after walking into a building that stored Iraqi ammunition yesterday afternoon, military intelligence officer Captain Adam Mastrianni told AFP. Mastrianni, attached to the division's Aviation Brigade, said initial tests showed the substance in the building was mustard gas, but more thorough tests were being conducted today to confirm that. "It's fairly likely it...