Police in the United Kingdom have made six more arrests in connection with the "Lizard Squad" attacks that brought down PlayStation Network and Xbox Live over the 2014 holidays.

Bloomberg reports that the suspects, all of them British teens, were taken into custody after an investigation by the U.K.'s National Crime Agency. The probe traced purchases of Lizard Stresser, a toolkit used in the attacks.

Lizard Stresser executed distributed denial-of-service attacks (DDoS) by using a network of computers and routers to swamp a target with bogus data, collapsing its ability to handle normal traffic.

All suspects are between 15 and 18 years old. The arrests took place in five different municipalities.

Lizard Squad claimed responsibility for phoning the threat that grounded a flight carrying the then-president of Sony Online Entertainment, John Smedley, in July 2014.

In December, the group began attacking the online services for the Xbox and PlayStation platforms, saying "chaos is entertainment," in an email to Polygon at the time.

One of their members, a Finnish teenager, later sought to justify the attacks as a demonstration against the two networks' poor security. He was arrested in December and in July was given a two-year suspended sentence by a court in his home country. He had faced potentially four months to four years in prison. Victims of his harrassment, including Smedley, blasted what they felt was a light punishment.

The holiday 2014 attacks were substantial enough that PlayStation Network later offered subscription extensions, purchase discounts and other premiums to compensate members for the lost time.