More details have emerged of an attack on an ambulance in Cardiff in which two paramedic staff were assaulted.
The paramedic was attacked on board an ambulance
Police say they are looking for a man who boarded the ambulance and left with a patient who is one of four teenagers arrested.
The man, thought to be a relative of the patient, drove them both away and police say he is a suspect.
A paramedic suffered a broken rib after youths boarded the vehicle and attacked him and a technician on Saturday night.
Four teenagers who were arrested have been released on bail pending further enquiries.
A 23-year-old man arrested on Tuesday was released without charge.
The paramedic also suffered facial attacks and the technician was treated for shock.
The crew, who had been attending a call in the Grangetown area, were able to alert police by pressing a panic button on board the ambulance.
Another ambulance crew was sent to assist and they took the two staff to the University Hospital of Wales in Cardiff.
Both were later discharged from hospital.
Police are looking for a man who is known to have boarded the ambulance during the incident at around 2350 GMT on Saturday.
It is thought he is related to the patient.
Det Insp Paul Andrews said: "We know this man boarded the ambulance and took the patient away in a silver Golf hatchback car.
Police are appealing for witnesses who were in the street to help
"This man is white, aged 40 to 45, with greying black hair which was swept back.
"My message to this man is - if you don't come to see us, we will be coming to see you.
"There is no doubt that some members of the Grangetown community know this man and would appeal for them to help us. Any information given will be treated in the strictest confidence."
Det Insp Andrews added that he wanted to reassure the community that every effort was being made to catch those responsible.
Anyone with information about this man or about the incident is asked to contact Cardiff central CID on 02920 222111 or Crimestoppers on 0800 555111.