A child cries in a military helicopter after being evacuated by Iraqi forces from Amerli, north of Baghdad. The United Nations has agreed to send investigators to Iraq to examine crimes being committed by Islamic State militants on ‘an unimaginable scale’, with a view to holding perpetrators to account. Photograph: Reuters.

The United Nations has agreed to send investigators to Iraq to examine crimes being committed by Islamic State militants on “an unimaginable scale”(...)