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Banners similar to those left by Mexican drug cartels appeared Thursday threatening to attack schools in three communities outside the northern Mexico city of Monterrey.
Similar banners and messages left near schools in the southern city of Acapulco led dozens of grade schools to close in late August. But there was no immediate indication that the banners left in communities in the township of Santiago on the outskirts of Monterrey would affect classes there.
Santiago Mayor Vladimiro Montalvo Salas said he asked state and federal authorities to step up security in the township, but urged parents to continue sending their children to school.
Arturo Martinez, the spokesman for the government of Guerrero state, where Acapulco is located, said Gov. Angel Aguirre had signed an agreement with leaders of local teachers unions pledging increased security for schools that were targeted by threats and extortion demands.
Estimates vary on how many schools were affected. Edith Zurita Petatan, spokeswoman for striking teachers, claimed hundreds of schools shut down in the seaside city of almost 800,000 people. The state government said only about 50 schools closed.