In 2007, Pam Geller published a letter from a Muslim hater in Norway that warned of a Muslim takeover and vowed: "We are stockpiling and caching weapons, ammunition and equipment. This is going to happen fast" http://is.gd/cAzcjL
She recently deleted that line from the post on her site: http://is.gd/FQOpbf (though it's still available from the Wayback machine)
In the comment section to the post at the time, she said she was purposely shielding the identity of the letter-writing -- by publishing it anonymously - in order to prevent the writer from being investigated and prosecuted http://is.gd/ef5YUo
If this were an attack by a Muslim group, and a Muslim had something like this on his/her website, the FBI and multiple other groups would be swarming.