Update: added new link to Geneabloggers.
Nice explanation on Geneabloggers about the attack.
According to Ancestry.com, they are experiencing DDoS attack. This appears to apply to the various baby Ancestry sites like Find-A-Grave, Fold3, RootsWeb, etc. For more information on DDoS attacks. It is unknown how long this outage will last. If you still need an Ancestry fix, you can try their YouTube page, PInterest boards. If you need more options, consider using FamilySearch, MyHeritage, Mocavo, BillionGraves, WikiTree, TribalPages, or other sites.
I will update once access is available again.