REUTERS- Islamic State urged its followers on Monday to attack citizens of the United States, France and other countries which have joined a coalition to destroy the militant group.
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Islamic State spokesman Abu Mohammd Adnani also taunted U.S. President Barack Obama and other Western "crusaders" in a statement carried by the SITE monitoring website, saying their forces faced inevitable defeat at the militants' hands.
The United States is building an international coalition to combat the radical Sunni Muslim group, which has seized swathes of territory in Iraq and Syria and proclaimed a caliphate in the heart of the Middle East.
U.S. and French warplanes have struck Islamic State targets in Iraq and on Sunday the United States said other countries had indicated a willingness to join it if it goes ahead with air strikes against the group in Syria too.
Adnani said the military intervention by the U.S.-led coalition would be the "final campaign of the crusaders", according to the transcript published by SITE.
"It will be broken and defeated, just as all your previous campaigns were broken and defeated," he said in the statement, which urged followers to attack U.S., French, Canadian, Australian and other nationals.
Obama has authorized airstrikes in Syria aimed at denying Islamic State fighters safe havens there. Washington has also committed $500 million to arm and train Syrian rebels and has sent 1,600 U.S. troops back into Iraq to fight the group..
In his statement, Adnani mocked Western leaders over their deepening military engagement in the region and said Obama was repeating the mistakes of his predecessor, George W. Bush.
"If you fight it (Islamic State), it becomes stronger and tougher. If you leave it alone, it grows and expands. If Obama has promised you with defeating the Islamic State, then Bush has also lied before him," Adnani said, according to the transcript.
Addressing Obama directly, Adnani added: "O mule of the Jews, you claimed today that America would not be drawn into a war on the ground. No, it will be drawn and dragged. It will come down to the ground and it will be led to its death, grave and destruction."
Obama, who has spent much of his tenure extracting the United States from Iraq after its costly 2003 invasion and occupation, is sensitive to charges that he is being drawn into another long campaign that risks U.S. soldiers' lives.
While Obama has ruled out a combat mission, military officials say the reality of a protracted campaign in Iraq and possibly Syria may ultimately require greater use of U.S. troops, including tactical air strike spotters or front-line advisers embedded with Iraqi forces.