Infamous hacker group LizardSquad is claiming responsibility for sporadic DDOS attacks on both Destiny and Call of Duty: Ghosts. At the time of writing, players are slowly being kicked, with the error message of "Cattle."
Players are unable to login past "Signing in," upon which they receive the error.
Reddit users are reporting similar occurrences as LizardSquad tweets responsibility for the attacks. You may remember LizardSquad from the PSN outage earlier in August, and it looks like they're up to no good once more.
We're going to be keeping an eye on the attacks, with more information as the story develops.
Update: It looks like some users are now able to sign back in.
Also, it appears as though there is another DDOS having been launched against The Escapist's forums. It's unclear whether or not these incidents are related at this time.