ON STRIKE: Teachers walk the picket line outside the Peters Township Middle School this morning. Negotiations between the Peters Township School District and the union representing its teachers broke down after nearly eight hours late Tuesday night without a contract, and teachers went on strike today. Classes have been canceled for the district’s 4,300 students. For more, see post-gazette.com. (Photo by Darrell Sapp/Post-Gazette) #Pittsburgh #Strike #TeacherStrike