Enlarge / ATM at a Patelco Credit Union branch in Dublin, California, on July 23, 2018. (credit: Getty Images | Smith Collection/Gado )

A California-based credit union with over 450,000 members said it suffered a ransomware attack that is disrupting account services and could take weeks to recover from.

“The next few days—and coming weeks—may present challenges for our members, as we continue to navigate around the limited functionality we are experiencing due to this incident,” Patelco Credit Union CEO Erin Mendez told members in a July 1 message that said the security problem was caused by a ransomware attack. Online banking and several other services are unavailable, while several other services and types of transactions have limited functionality.

Patelco Credit Union was hit by the attack on June 29 and has been posting updates on this page, which says the credit union “proactively shut down some of our day-to-day banking systems to contain and remediate the issue… As a result of our proactive measures, transactions, transfers, payments, and deposits are unavailable at this time. Debit and credit cards are working with limited functionality.”