TORONTO (AP) — A Canadian-owned dating website for married people seeking affairs says it has suffered a cyberattack after hackers claimed to have stolen confidential customer information, threatening to publish it unless the company is shut down.

Avid Life Media, which owns Toronto-based site AshleyMadison.com, said Monday that it had taken steps to secure its sites.

Ashley Madison, whose slogan is “Life is short. Have an affair,” claims it has more than 37 million anonymous worldwide members.

Online security blog KrebsOnSecurity.com posted what appeared to be a screenshot of the site’s home page on Sunday bearing a message from the hackers, who said they acted to expose alleged lies Ashley Madison told customers about a service that allows members to erase profile information.