End-to-end encrypted messaging app Signal says attackers accessed the phone numbers and SMS verification codes for almost 2,000 users as part of the breach at communications giant Twilio last week.

Twilio, which provides phone number verification services to Signal, said on August 8 that malicious actors accessed the data of 125 customers after successfully phishing multiple employees. Twilio did not say who the customers were, but they are likely to include large organizations after Signal on Monday confirmed that it was one of those victims.