Islamic State fighters halted an Iraqi army assault on the city of Fallujah with a counterattack at its southern gates on Tuesday, while the United Nations warned of peril for civilians trapped in the city and used by militants as human shields.
The Iraqi army's assault on Fallujah has begun what is expected to be one of the biggest battles ever fought against Islamic State, the militant group also known as ISIS, ISIL or Daesh. The government, backed by world powers including the US and Iran, is determined to win back the first major Iraqi city that fell to the group in 2014.
A week after Baghdad announced the start of the assault, its troops advanced in large numbers into the city limits for the first time Monday, pouring into rural territory on its southern outskirts but stopping short of the main built-up area.


