NATO is “actively addressing” multiple IT security incidents after a hacktivist group claimed it once again breached some of the military alliance’s websites, this time stealing what’s claimed to be more than 3,000 files and 9GB of data.

When asked about this alleged intrusion, a NATO official declined to answer specific questions and told The Register:

NATO is facing persistent cyber threats and takes cyber security seriously. NATO cyber experts are actively addressing incidents affecting some unclassified NATO websites. Additional cyber security measures have been put in place. There has been no impact on NATO missions, operations and military deployments.

On Sunday, the SiegedSec crew claimed it broke into six NATO web portals: the alliance’s Joint Advanced Distributed Learning e-learning website; the NATO Lessons Learned Portal, from which the gang said it stole 331 documents; the Logistics Network Portal (588 documents and other files); the Communities of Interest Cooperation Portal; the NATO Investment Division Portal (207 documents); and the NATO Standardization Office (2,116 documents).

The hacktivists, which describe themselves as made up of “gay furry hackers,” usually target government orgs whose policies they disagrees with, and have a flare for political publicity stunts, also posted a link to the purported stolen files on their Telegram channel.