EA's Origin distribution service is currently offline, with players unable to connect to the store, make purchases or play multiplayer.
Hacker group DERP has taken responsibility for the attacks via their, claiming to have "directed the Gaben Laser Beam at the EA login servers".
EA Support is working to resolve the issue according to their own twitter feed.
DERP have used similiar DDOS attacks to bring down games and services in the past. This time the motive appears to be support for Origin's rival distribution service Steam, according to further tweets on their twitter feed.