IS has stalled in Iraq and Syria but officials believe it has been planning new attacks on west for years
Islamic State (IS) remains defeated in its core strongholds of the Middle East but has made significant progress in Africa and parts of south Asia, winning territory and resources that could serve as a launchpad for a new campaign of extremist violence, analysts and officials believe.
European governments have moved to their highest levels of alert for years after the attack on a concert hall in Moscow last week by militants from IS which killed 140 people.
