The Exton-based company said data was stolen, systems were encrypted and some shipping, receiving and manufacturing processes are still being restored.
Town offices were closed for parts of three days in February, but officials have not publicly linked that outage to the ransomware group’s March posting.
District officials said an outside actor accessed some systems, prompting a shutdown that canceled classes, child care and after-school programs Monday.
City officials said a March 14 attack hit a water treatment plant server, but the water supply stayed safe while staff ran manual procedures for about 16 hours.
