Treyarch has confirmed that a Double XP Weekend for Call of Duty Black Ops will take place from Friday, running through to Tuesday in celebration of Call of Duty: Black Ops - Annihilation's release.

The event begins Friday at 10am PDT (6pm BST by our calculations) and ends the same time on Tuesday.

The latest Double XP Weekend is celebrating the launch of Annihilation - currently only available on Xbox 360 - but you'll still be able to rack up XP at twice the usual pace on PS3, PC and the Wii too.

In case you're wondering why the Double XP Weekend actually lasts into Tuesday, that's because Treyarch is also using the event to celebrate Independence Day.