The public school district in Springfield, Massachusetts, said schools would be closed Tuesday after a "cyber incident" interrupted services. Springfield Public Schools announced the breach on Monday, saying that it impacted "some systems necessary for essential school operations." Classes and after-school activities are canceled Tuesday. Stream NBC10 Boston news for free, 24/7, wherever you are. The district did not say what was targeted or if the data of school community members was compromised, adding that the size and scope are under investigation. "We understand that an unexpected closure creates significant challenges and we appreciate the patience, flexibility and understanding of the entire Springfield Public Schools community as we work to address this incident and restore systems," Superintendent Sonia Dinnall said in a statement shared by the district. Staff members and students with school-issued laptops are being told to stay off of district network systems. "The decision to close schools is not made lightly," Dinnall said. "The most important consideration will always be the health and safety of those inside our school buildings. We simply are not willing to risk any lapse in that." The central office remains open, but services, including phone lines, might be affected by the breach, the district said.