The hacking group that attacked publishing giant Electronic Arts in June of this year have released some of their haul in an attempt to extort the firm.

As reported by Vice's Motherboard, the group has posted a compressed cache of 1.3GB of data on a forum that contains references to internal EA tools, as well as EA's Origin storefront. The hackers said that they emailed Electronic Arts attempting to secure a ransom, but have not heard back so have started posting data they stole in an attempt to get EA to pay out.

"If they dont contact us or dont pay us we will keep posting it," one post read.

The group reportedly stole around 780GB of data, including the source code for DICE's Frostbite engine and games including FIFA and Battlefield.

"We are investigating a recent incident of intrusion into our network where a limited amount of game source code and related tools were stolen," said an EA spokesperson said at the time.

"No player data was accessed, and we have no reason to believe there is any risk to player privacy. Following the incident, we’ve already made security improvements and do not expect an impact on our games or our business. We are actively working with law enforcement officials and other experts as part of this ongoing criminal investigation."

This follows a similar cyber attack against Polish games firm CD Projekt.