MAPUSA: The Calangute police have booked the Candolim guest house management in the drowning case of the four-year-old. According to sources, post mortem report Sambhav Talkar revealed that the cause of death was due to suffocation, as a result of drowning. Calangute police investigation revealed that the boy drowned due to negligence of the guest house management. An offence was registered under section 304A of IPC against the management and staff of Casa Almeida Guest House, Candolim. Further investigating is on.