(IRIN) – It was a typically humid afternoon in Pie de Pepé when a gunshot pierced the calm of the tiny town in Colombia’s Baudó region near the Pacific coast. Edwin Jackson Mosquera fell to the ground on the dirt road he had been walking along to start his shift at the local police station. Police killings are nothing new in Colombia, where government security forces have been fighting an array of armed groups for decades. But the circumstances of the 8 May murder of Mosquera, a 29-year-old father of two, remain murky.