The UN Secretary General has said an international tribunal might be the only way to prosecute those responsible for mass killings in South Sudan.

Thousands of civilians have been targeted in the months of fighting, and the UN said those atrocities could amount to war crimes and crimes against humanity.

South Sudan's conflict broke out in December of last year as a political dispute but quickly broke down along ethnic lines between loyalists of President Salva Kiir and his former deputy Riek Machar.

Al Jazeera's Malcolm Webb reports from Malakal, a town which saw one of the worst massacres since the conflict began.

Source: Al Jazeera