A hacker group has disrupted the online functionality of two Activision games for a second time in September.

The online group, Lizard Squad, also claims to have downed servers for certain EA games, though it didn't specify which.

It appears that North American servers of Destiny and Call of Duty: Ghosts were the most affected, with the problem prompting developer Bungie to issue a notice to fans.

The Twitter account for Bungie's support team wrote: "We're aware of connection issues affecting portions of the Destiny player base and we're working to correct the problem. Please stay tuned."

However, at the time of going to press, the message had been deleted. Activision previously declined to comment on the attacks when approached for comment by GameSpot.

Hacker groups tend to use a distributed denial-of-service (DDoS) attack to take down game servers. It works by flooding a system with an overwhelming number of requests, thereby crashing the servers.

Lizard Squad has not explained reasons for its attack, though days before it wrote on Twitter: " We're predicting a lot of mad gamers this weekend".