The Japan Association of Zoos and Aquariums says hackers stole phone numbers and email addresses of thousands of zoo and aquarium workers nationwide in an incident earlier this year.

JAZA said Wednesday that Anonymous, a loose network of hackers and activists, penetrated two JAZA websites, retrieved members-only data and published it online.

JAZA said it temporarily shut down the website from which data was stolen. The organization was unavailable for further comment when reached by a reporter on Wednesday.