Federal agents served a search warrant on Thursday at the Pennsylvania Cyber Charter School in Midland, the largest cyber school in the state with more than 11,000 students. The Department of Justice would not say what agents with the FBI, the Internal Revenue Service and the Department of Education were seeking there or at least three other locations where warrants were served. In a statement, the Justice Department said the Beaver County school, founded in 2000, “is not a current target of this investigation.” Founder Nick Trombetta, 57, could not be reached for comment. On June 30, he stepped down...