Close to 30,000 Chicago teachers went on strike Monday for the first time in 25 years, according to their union. The educators have been locked in a struggle with Mayor Rahm Emanuel’s administration over reforms to city education Emanuel wants to implement. “We have failed to reach an agreement that will prevent a labor strike,” said Chicago Teachers Union president Karen Lewis on Sunday. “In the morning no CTU members will be inside our schools.” It is estimated that 350,000 students will be affected. On Monday morning officials told The Associated Press that measures were being taken to ensure student safety.