Jayati Ramakrishnan reports: A Portland-area school district has canceled Tuesday and Wednesday classes as staffers work to fix a ransomware attack that may have affected the district’s technology systems. Centennial School District staff discovered Monday that certain digital files had been “encrypted by an unknown actor,” the district said in a statement. The district took its technology systems offline as a precaution so hackers could not access any more information. Read more on The Oregonian. The district’s web site was unreachable at the time of this publication.