The UK'S National Crime Agency announced today that it has arrested five teens in connection with Distributed Denial of Service (DDoS) attacks which took down servers for popular online services -- including Xbox Live and PlayStation Network, Variety reports.

Another was questioned, but not arrested. For the year, that makes seven arrests against teenagers accused of using Lizard Squad's "Lizard Stresser" DDoS tool, as part of "Operation Vivarium." The group offers the tool for sale, according to the NCA.

The group claimed responsibility for an attack on Sony's PlayStation Network service last year, and reputedly executed attacks on PSN and Xbox Live on Christmas last year.

Attacks like these can have significant effects on developers, as former Game Developer magazine and current indie dev Brandon Sheffield writes in this blog post about the Microsoft and Sony downtime.