(CNN) - American-born al Qaeda spokesman Adam Gadahn appears in a new video purportedly from the organization, calling President Barack Obama "snakelike" and saying he is "running the affairs of a declining and besieged empire."
In the video, posted Sunday on Islamist websites, Gadahn criticizes what he says is the United States' "aggression and interference" in Afghanistan, Pakistan, Yemen and Somalia, and also criticized moving his "captive brothers" from detention centers worldwide to "Muslim-only concentration camps in Illinois, Bagram (Air Base) and elsewhere - all in the name of protecting the American people from the threat of Muslim retaliation for American crimes."
He is apparently referring to a maximum-security prison in Thomson, Illinois, being considered by the government as a possible venue to house terror suspects.
CNN could not independently verify the authenticity of the 24-minute video, posted on websites known to carry such messages in the past and carrying the name of as-Sahab, al Qaeda's media arm. In it, Gadahn speaks in English; the video features Arabic subtitles.