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The failure to bring Britons who fought for the Islamic State group to justice in the UK is a "dereliction of responsibility", a top US counter-terrorism official has said.

Since the fall of group's last Syrian stronghold, Baghuz, the US has stepped up efforts to get foreign fighters and their families repatriated.

But it is "frustrated" with the UK's failure to take back British fighters.

US Coordinator for Counter-terrorism Nathan Sales has said "it's a dereliction of responsibility to expect the Syrian Democratic Forces to solve this problem or to expect the Iraqi government to solve this problem".

Producer Maria Polachowska and Diplomatic Editor Mark Urban report.