Islamic State militants pose 'biggest threat' to US
Top US officials have warned that Islamic State (IS) militants are the most dangerous threat America has faced in years.
Defence Secretary Chuck Hagel said US strikes had weakened IS in Iraq, but the group could be expected to regroup.
America's top general Martin Dempsey said IS fighters could not be defeated without attacking its base in Syria.
The conflict has fuelled sectarian tensions in Iraq.
The warnings come after IS beheaded US journalist James Foley.
WATCH: The Gleaner Minute