Thousands of Mexican police firing tear gas fought a running battle with striking teachers in a southern city on Wednesday in the latest violence between protesters and security forces before July elections. Backed up by a helicopter clattering overhead, police on foot briefly dislodged teachers from the main square in the city of Oaxaca where they had been camped for three weeks demanding higher wages.
See "Mexico Police and Teachers Clash Ahead of Polls", Reuters, The New York Times, June 14, 2006