Killer fumes on a boat: this is how a 21-year-old died in Portisco.

Fumes from the chemical toilet or batteries may have killed the 21-year-old man found dead this morning on a 17-meter motorboat moored at dock number 7 of the Marina di Portisco, at the gateway to the Costa Smeralda, in the municipality of Olbia.

These are the hypotheses being examined by the investigators who arrived on the scene when the body was found.

State police officers and the forensic section are continuing the investigation, with firefighters from the bacteriological unit called in to further verify what happened on board the vessel.

The Coast Guard is also at work.