A new 48-minute recording released this weekend apparently came from Adam Gadhan, the California farm boy who has become an English-speaking voice of the international terrorist organization.
"It is the duty of everyone who is sincere in his desire to defend Islam and Muslims today, to take the initiative to perform the individual obligation of jihad," Gadhan said.
CBS News said the recording was made available by SITE, a U.S. organization that monitors terrorist activities.
Gadhan specifically called on Muslims living in "the miserable suburbs of Paris, London and Detroit" to rise up and attack.
The call didn't sit well with leaders of Detroit's large Muslim community. "He obviously doesn't know Muslims in Detroit," Dawud Walid, head of the Michigan branch of the Council on American-Islamic Relations, told the Detroit Free Press. "It appears to be a desperate plea by al-Qaida, which has virtually no support among Muslims in any Western countries."