Tortured and killed: Hamza al-Khateeb, age 13

The mutilation and death in custody of a 13-year-old child has sparked further furious protests in Syrian city of Daraa

Hamza al-Khateeb used to love it when the rains came to his small corner of southern Syria, filling up the farmers' irrigation channels enough so that he and the other children could jump in and swim.

But the drought of the last few years had left the 13-year-old without the fun of his favourite pool.

Instead, he'd taken to raising homing pigeons, standing on the roof of his family's simple breeze-block home, craning his neck back to see the birds circling above the wide horizon of fields, where wheat and tomatoes were grown from the tough, scrubby soils.

Though not from a wealthy family himself, Hamza was always aware of others less fortunate than himself, said a cousin who spoke to Al Jazeera.

The child had spent nearly a month in the custody of Syrian security, and when they finally returned his corpse it bore the scars of brutal torture: Lacerations, bruises and burns to his feet, elbows, face and knees, consistent with the use of electric shock devices and of being whipped with cable, both techniques of torture documented by Human Rights Watch as being used in Syrian prisons during the bloody three-month crackdown on protestors.

Hamza's eyes were swollen and black and there were identical bullet wounds where he had apparently been shot through both arms, the bullets tearing a hole in his sides and lodging in his belly