ISIS, as the Islamic State jihadists in Iraq and Syria are known, has become the new face of international terrorism in the eyes of the United States and its Western allies. 

Now the focus in America and abroad has become what will President Barack Obama and other leaders do about it? 

Here are key questions on the matter: 

1) Who killed James Foley? 

Britain's ambassador to the United States, Peter Westmacott, told CNN on Sunday that British officials were close to identifying the ISIS militant who beheaded Foley, an American journalist captured in Syria in 2012. 

He couldn't elaborate on the identity of the killer, who is seen decapitating Foley in a video posted last week on YouTube. 

"We're putting a great deal into the search," he said, referring to the use of sophisticated technology to analyze the man's voice. 

In the video, Foley, 40, is seen kneeling next to a man dressed in black, who speaks with what experts say is a distinctly English accent. 

Linguists said that based on his voice, the man sounds to be younger than 30. He also appears to have been educated in England from a young age and to be from southern England or London. 

Britain close to identifying James Foley's killer, ambassador says 

2) Will the United States expand air strikes to ISIS targets in Syria? 

Pressure is increasing on Obama to go after ISIS in both Iraq and Syria, ignoring an essentially non-existent border between them. 

Last week, Defense Secretary Chuck Hagel and Joint Chiefs Chairman Gen. Martin Dempsey said that taking on ISIS in Syria was the only way to defeat the Sunni jihadists. 
What was his fate?
killed James Foley