It started as a typical market day for refugees in a camp in north Darfur. Adults busy trading, children playing in the sandy terrain. But it was a day that was to turn into tragedy.

A group of boys was playing football on the camp's fringes when eight Arab militiamen, known as Janjaweed, rode by on camels and horses. Two of them stopped and began shooting, killing a four-year-old and a 10-year-old.