The Newtown Public School District reopened all but two of its schools on Tuesday after last week’s deadly shootings, which left 20 children and six educators dead. The schools opened two hours later than usual and all had police officers standing guard. Sandy Hook Elementary is expected to remain closed until January, and Head O'Meadow Elementary School received a phone threat. School officials weren’t taking any chances so they shut Head O'Meadow down “out of an abundance of caution,” a spokeswoman said. Children from Sandy Hook will resume classes at the Chalk Hill School, a former middle school.