Via Twitter:

Our site is still under escalating DoS attack. We are working hard to bring it back up, but service is intermittent. Stay tuned! #OWS

— Occupy Wall Street (@OccupyWallSt) May 18, 2012

http://NATOprotest.org also down.

Here are some other places to get updates: http://occupychi.org http://chicagospring.org http://cang8.wordpress.com http://chicago.indymedia.org

Also watch for updates on Facebook.