Nadia Murad, a Yazidi human rights activist and survivor of sexual slavery by Islamic State in Iraq, and Denis Mukwege, a gynaecologist treating victims of sexual violence in the Democratic Republic of Congo, have jointly won the 2018 Nobel Peace Prize.

The Norwegian Nobel Committee said it had awarded them the prize for their efforts to end the use of sexual violence as a weapon of war.

"Both laureates have made a crucial contribution to focusing attention on, and combating, such war crimes," it said in its citation.

Ms Murad is an advocate for the Yazidi minority in Iraq and for refugee and women's rights in general. Aged 19, she was enslaved and raped by Islamic State fighters in Mosul in 2014.

She fled Iraq and spoke openly about the abuse she suffered - repeatedly gang-raped, tortured and beaten during the three months she was held.