A US-backed alliance of Syrian Kurdish and Arab fighters says it has taken full control of so-called Islamic State's one-time "capital" of Raqqa.

Syrian Democratic Forces (SDF) spokesman Talal Sello said the fighting was over after a five-month assault.

Clearing operations were now under way to uncover any jihadist sleeper cells and remove landmines, he added.

An official statement declaring victory in the city and the end of three years of IS rule is expected to be made soon.

Earlier on Tuesday, the SDF cleared the last two major IS positions in Raqqa - the municipal stadium and the National Hospital