What next for Islamic State?

Trump claimed before and after Baghdadi's killing that the Islamic State group had been destroyed and defeated, but how accurate is that?

Mazloum Abdi, head of the Kurdish-led Syrian Democratic Forces militia that rolled IS back with US backing, said he expects a backlash.

"Sleeper cells will seek revenge for Baghdadi's death," he told the AFP news agency. "This is why anything is possible, including attacks on prisons."

The SDF holds thousands of suspected IS members prisoner in Syria, and has repeatedly raised concern about their security as Turkish forces have staged an assault in the Kurdish-held northeast.