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.
Bellflower Unified said phone and network disruptions began in early August, followed by a months-long forensic review and a later, unconfirmed Rhysida claim.
The attack knocked out the office’s network, moved dispatch work to Seymour police and left officers filing reports in Word documents, according to Lt. Adam Nicholson.
