Yemen uses nerve gas on protesters 09 Mar 2011 Yemen government forces have used nerve gas against anti-government protesters as President Ali Abdullah Saleh come under mounting pressure to step down, reports say. Witnesses present at the scene of Tuesday's anti-government protests in the capital Sana'a said that what was originally thought to be tear gas may have been some form of nerve gas, reports said on Wednesday. Military personnel used live bullets and some form of gas on Tuesday night to disperse a group of demonstrators who were trying to bring more tents into the protest area outside Sana'a University.