On Friday, the terrorist network al-Qaeda confirmed the death of Osama bin Laden and vowed revenge against America for the killing of its spiritual leader.
The statement on a militant website said the former al Qaeda leader was a holy warrior. The group also promised future attacks that would turn Americans' happiness into tears of sorrow.
The terror group said it will remain a curse to Americans to make sure bin Laden's blood will not be wasted.
"The blood of the holy warrior sheik, Osama bin Laden, God bless him, is too precious to us and to all Muslims to go in vain," the statement said. "We will remain, God willing, a curse chasing the Americans and their agents, following them outside and inside their countries."
"Soon, God willing, their happiness will turn to sadness," it said, "their blood will be mingled with their tears."
"It is impossible, impossible. Sheik Osama didn't build an organization to die when he dies," the statement read. "The university of faith, Quran and jihad from which bin Laden graduated will not close its doors," the statement added.
Terror experts have said bin Laden's death on Monday was a setback for al Qaeda, but the threat of attacks remains and could even spike in coming days from individuals or small extremist groups inspired to take revenge for the killing.
The message comes as U.S. officials confirmed that newly uncovered documents found in bin Laden's residence revealed al-Qaeda plans for derailing an American train on the upcoming 10th anniversary of the Sept. 11 attacks.