Detectives investigating a series of fires at hospitals and other public buildings have released CCTV images of a man they wish to speak to in connection with the incidents.
Fires at both Kent and Canterbury Hospital, Canterbury at about 3pm on Thursday and Medway Maritime Hospital, Gillingham on Wednesday are linked, according to Kent Police.
Officers were at Kent and Canterbury Hospital with firefighters to investigate the cause of the blaze and a theft from the hospital restaurant. No one was injured in the fires at either hospital.
The fire at Kent and Canterbury Hospital is similar to a fire at Crawley Hospital, West Sussex on Tuesday.
Patients and visitors were evacuated because of the blaze in a sixth-floor store cupboard on Comet ward. No one was hurt but a small amount of cash was stolen from a till in the hospital restaurant during the fire, Sussex Police said.
Detectives are examining whether this blaze, which took place at 1.30pm, is linked to another three in Brighton.
The first suspected arson case in the city happened at Royal Albion Hotel in Old Steine at 2pm on Sunday, the second one was at 12 noon the following day at Brighton Museum and Art Gallery and the third was at the Sea Life Centre, also on Monday, at about 4.30pm.
The fires were all small but when staff returned to the buildings, cash had vanished from tills, police said.
Detectives want to speak to the man in the CCTV images, who they believe may have vital information for their inquiries. He is thought to be aged between 30 and 40, about 6ft and slim with dark, cropped hair which recedes at the sides. He is clean-shaven and has been seen wearing a black, round-neck, long-sleeved jumper, according to police.
Detective Superintendent Mick Judge, from the Kent and Essex serious crime directorate, said: "As yet the fires have all been determined as deliberate but small and contained, and no one has been harmed. Our investigation team is following up a number of lines of inquiry and we will continue to work closely with our colleagues at Sussex Police, the Fire and Rescue Service and the National Health Service to identify whoever is responsible."