Iraq is going to need more help from the United States and the international community, U.S. President Barack Obama said Thursday as a militant group gained control of Mosul, Iraq's second-largest city.

The Islamic State in Iraq and Syria, or ISIS, is threatening the takeover of more cities, including the capital, Baghdad.

ISIS wants to establish an Islamic caliphate, or state, stretching across the region.

Speaking to reporters at the White House, the President said the U.S. "will not rule anything out" with regard to the unrest in Iraq. "This is an area that we have been watching with a lot of concern," he said.

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