OAXACA, June 21, 2016 (Xinhua) -- A man walks next to the debris of a burned truck after a violent clash between policemen and teachers in Oaxaca, Mexico, on June 20, 2016. Six people were killed and more than 100 others wounded on Sunday in a violent clash between police and teachers in the southern Mexican city of Oaxaca, authorities said. (Xinhua/Max Nunez)
