The threat from Islamic State is not finished, despite the death of its leader in a US military operation.
That was the warning from experts after US President Donald Trump confirmed the death of Abu Bakr al Baghdadi on Sunday in Syria.
Chris Costa, a former senior director for counter-terrorism for the National Security Council in the Trump administration, said: "The bottom line is: This puts the enemy on its heels, but the ideology - and this sounds so cliched - it is not dead."
Mike Rogers, the ranking Republican on the house homeland security committee, said: "While the death of its leader is a tremendous blow for the group, about 10,000 ISIS fighters remain in the region and will continue to carry out guerrilla attacks and seek new territory."
Defence Secretary Mark Esper said on ABC's This Week: "Our job is to stay on top of that and to make sure that we continue to take out their leadership."
Experts have said that Islamic State is growing in numbers outside Syria, expanding its affiliate in Afghanistan and moving in to Pakistan, Tajikistan, Iran, India, Bangladesh and Indonesia.
Mr Trump said on Sunday that US special forces had conducted a "daring raid" which lasted around two hours, during which a large number of al Baghdadi's companions were also killed or captured.