Foreign Secretary Boris Johnson has vowed that the UK will lead efforts to bring Islamic State terrorists to justice.

Mr Johnson was joined by high-profile human rights lawyer Amal Clooney at an event at the United Nations in New York as he promised action to help victims of IS around the world see the group held to account.

Mrs Clooney is representing activist Nadia Murad Basee Taha, who was kidnapped and abused by IS in 2014 before escaping.

The Foreign Secretary said IS - also known as Daesh - had been "routed" on the battlefield in Iraq and Syria, but had left their former territories scarred.

He said: "Daesh has failed to establish the 'state' it had the preposterous ambition to create a caliphate in Iraq and Syria.

"They have been routed on the battlefield, they lost about half of the territory that they had in Iraq, and about one fifth in Syria. And thousands of people are proclaiming their joy at being liberated from Daesh rule.

"But whenever they are pushed back, I'm afraid Daesh leave an ineradicable scar on those communities: torture, massacre, rape, mass enslavement of minorities."

Mr Johnson added: "In the aftermath of such crimes, I believe we all have an obligation to ensure that justice is done."

The Foreign Secretary said he had agreed with his Iraqi counterpart to bring forward a proposal to the UN to lead the campaign.

He added: "Our aim has got to be justice for all of Daesh's victims: the Sunni and Shia Arabs who are still suffering under its murderous rule; the minorities who have been so pitilessly targeted; the victims elsewhere in the Middle East; and of course those who are maimed and killed in terrorist attacks in Europe and elsewhere, and indeed in this country, here in the United States."