Who's behind an air strike that killed refugees in Libya?

UN envoy condemns the attack as a 'war crime' and says those responsible must be held to account.

African migrants and refugees have become the latest victims of Libya's civil war.

At least 44 people died in an air strike on a detention centre in the capital Tripoli.

The UN's special envoy to Libya is calling it a war crime.
And the UN-recognised government in Tripoli is blaming warlord Khalifa Haftar, whose forces have been fighting to seize the city.

The victims are among tens of thousands of Africans hoping to cross the Mediterranean Sea to start a new life in Europe.