The beheaded body was clad in a bright orange suit, similar to those issued to suspected Islamic militants imprisoned by the United States at Guantanamo Bay - and similar to the suit another American captive, Nicholas Berg, was wearing when he was beheaded in Iraq last month by another group of Islamic militants inspired by al-Qaida.
"To the Americans and whoever is their ally in the infidel and criminal world and their allies in the war against Islam, this action is punishment to them and a lesson for them to know that whoever steps foot in our country, this decisive action will be his fate," the statement said.
Soon after the statement appeared, the website was inaccessible, with a message saying it was closed for maintenance.
Arab satellite network Al-Arabiya said there was also a video of the beheading.
An Internet site often used by Islamic militant groups linked to al-Qaida displayed a link to Johnson's beheading, but initial efforts to access the video were unsuccessful.
Oooh, they don't know what to to do, huh? Well, if the Islamist media outlets have got their collective boob caught in a wringer over this then all I can say is...goody.