Striking Teachers Forced Off Mexico City Plaza     Police using
water cannons and tear gas rolled into the main plaza in
downtown Mexico City yesterday to remove thousands of protesting
teachers. They've been camped out since mid-August and are upset
about a new law aimed at overhauling Mexico's failing education
system. Federal authorities vowed to remove the protesters
before this Sunday's Independence Day. From Mexico City, NPR's
Carrie Kahn reports.  CARRIE KAHN, BYLINE: The teachers had been
in Mexico City's historic Zocalo Plaza for weeks. It took less
than an hour to push them out. But they didn't leave without a
fight. Hundreds blocked side streets with metal gates and
plastic traffic dividers. They set trash on fire and constantly
engaged police in violent confrontations.  UNIDENTIFIED MAN:
(Yelling in foreign language)  KAHN: The police have just shot
tear gas at the crowd that is yelling profanities at them and
started throwing sticks and other objects at the police. The
crowd carrying sticks. Some