More than two years after the start of the Syrian uprising, the BBC has spoken exclusively to some of the boys whose actions helped spark the country's revolution.

Inspired by some graffiti in Deraa, celebrating the Arab Spring, the boys added their names and messages calling for the fall of Bashar al-Assad's regime.

Fifteen other boys from their school were arrested and tortured as a result, leading to some of the biggest demonstration the regime had faced. Some local boys were killed, others were forced into exile.

As Fergal Keane reports, children on both sides of the regime have been traumatised, with the UN warning of "a lost generation of Syrian children".