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This is actually an issue related to a large scale botnet attack on WordPress sites across various web hosts.
You can check out the article I just wrote on gaining access to your WordPress sites again, it details the <a href="http://www.inmotionhosting.com/support/news/general/wp-login-brute-force-attack" target="_blank">WordPress wp-login.php brute force attack</a> that is currently taking place.
Please let us know if you have any other questions at all!
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