An elderly kidney patient was locked in the back of an ambulance for five hours after the driver forgot about him and clocked off duty.
The 65-year-old man was trapped at Sharston ambulance station in Manchester from the early evening until the middle of the night, Sky News reported.
Staff at the patient's care home contacted police after he failed to return from a regular hospital appointment in a non-emergency ambulance.
It is thought the driver forgot about the man after dropping off three other patients.
Ambulance bosses have apologised in person to the man and his family.
"A member of staff has been suspended with immediate effect and the Trust has commenced a full investigation," Darren Hurrell, chief executive of the North West Ambulance Service, told Sky News.
"We have met with the patient and family to discuss the matter with them in greater detail and will continue to liaise closely with them throughout this process."