Prosecutors in the northern city of Forlì are investigating a 27-year-old man, currently suspended from the Italian Red Cross

Prosecutors in the northern Italian city of Forlì are investigating an ambulance driver on suspicion of murdering five elderly patients.

All the suspicious deaths occurred while or soon after the patients were transported in an ambulance driven by the 27-year-old man, lawyers of the victims told the Guardian.

Investigative sources told the ANSA state news agency they believe the man, who worked for the Italian Red Cross but has now been suspended, may have administered harmful substances to the patients during transfers between hospitals and care homes in the Emilia-Romagna region.

Authorities are also examining additional cases, raising concerns that the number of potential victims could rise as the inquiry widens.