Young teachers block a major highway as they chant slogans, one holding a metal pipe, as a federal police helicopter flies overhead in Chilpancingo, Mexico, Thursday, April 11, 2013. The teachers, who are protesting an educational reform that will submit them to evaluation and loosen union control over hiring and firing, left peacefully after negotiating with police. (AP Photo/Alejandrino Gonzalez)

Associated Press
Young teachers block a major highway as they chant slogans, one holding a metal pipe, as a federal police helicopter flies overhead in Chilpancingo, Mexico, Thursday, April 11, 2013. The teachers, who are protesting an educational reform that will submit them to evaluation and loosen union control over hiring and firing, left peacefully after negotiating with police. (AP Photo/Alejandrino Gonzalez)
Young teachers block a major highway as they chant slogans, one holding a metal pipe, as a federal police helicopter flies overhead in Chilpancingo, Mexico, Thursday, April 11, 2013. The teachers, who are protesting an educational reform that will submit them to evaluation and loosen union control over hiring and firing, left peacefully after negotiating with police. (AP Photo/Alejandrino Gonzalez)
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