EBay Inc said that hackers raided its network three months ago, accessing some 145 million user records in what is poised to go down as one of the biggest data breaches in history, based on the number of accounts compromised.

It advised customers to change their passwords immediately, saying they were among the pieces of data stolen by cyber criminals who carried out the attack between late February and early March.

EBay spokeswoman Amanda Miller told Reuters late on Wednesday that those passwords were encrypted and that the company had no reason to believe the hackers had broken the code that scrambled them.

More: Hackers Raid eBay in Historic Breach, Access 145 Million Records

More from Dan Goodin at Ars Technica on EBAY burying the news.