The group which claimed responsibility for the Madrid train massacre threatened that America was on the verge of another deadly terror attack.
The group, speaking in the name of al Qaida, said plans to strike America with a "black wind of death" were 90% complete.
The warning was sent to the London-based Arabic newspaper, Al Quds, by The Brigade of Abu Hafs al-Masri.
It said: "We announce the good news for the Muslims in the world that the strike of the black wind of death, the expected strike against America, is now at its final stage - 90% ready - and it is coming soon, by God's will.
"The faithful will be happy for God's victory," it added.
The editor of Al Quds, Abdel Bari Atwan, said he believed the claim of responsibility was genuine.
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