Anonymous has threatened to expose individual agents belonging to Interpol after it arrested 25 suspected members in Europe and South America.
Interpol launched Operation Unmask in mid-February after a series of cyber-attacks against private and government targets.
The international police agency said that about 250 items of IT equipment and mobiles were seized during searches of 40 premises across 15 cities in Argentina, Chile, Colombia and Spain. The suspected hackers are aged 17-40.
In retaliation, Anonymous hackers attacked Interpol's website with a Distributed Denial of Service (DDoS) and briefly took it down. According to the Guardian, the site was "quickly back up and running but was loading slowly".
But a tweet by a prominent Anon called Sabu may suggest further actions by the collective against Interpol.
"Interpol dubbed their attempt at arresting anons Operation Unmask - funny. Let us assist them by unmasking and exposing Interpol agents," tweeted Sabu.
He sent out a link to a database of hacked Stratfor login information that includes some Interpol emails. "Doxing" - revealing personal information online - is typical of the collective.