With the acrid smell of burning tyres hanging in the air, Conakry resident Mariame Diallo pointed to blood splatters on a wall where she said her teenage brother was shot at close range during a protest in the capital against Guinea’s military government on May 11.

“I will never forgive those who killed him,” she said between bouts of quiet crying.

Clutching a bag of blood-soaked clothes that she hopes will be used for a police investigation that has yet to begin, she recalled how her apprentice brother, Boubacar, fearing the anti-government demonstrations, stayed at home, only to be shot dead by police in front of the family house.

A spokesman for Guinea’s government did not respond to a request for comment.