(AP) President Barack Obama is telling the United Nations amid a U.S.-led bombing campaign against Islamic State militants that he will build a coalition to "dismantle this network of death."



Obama told the assembled leaders on Wednesday that the "only language understood by killers like this is the language of force."



In remarks prepared for delivery, the president warned those who have joined the Islamic State to "leave the battlefield while they can."



After weeks of launching strikes against militant targets in Iraq, Obama extended the military action into Syria on Monday. The U.S. was joined by a coalition of five Arab nations.