Sussex police are investigating whether four arson attacks in three days could be linked.
The most recent incident took place at on Tuesday in a store cupboard on Comet Ward on the Sixth Floor at Crawley Hospital.
All patients and visitors were safely evacuated, but during the fire a small quantity of cash was stolen from the till in the hospital restaurant.
The first arson took place on Sunday at The Royal Albion Hotel in Brighton and the second fire was on Monday at the Brighton Museum and Art Gallery. The third fire, also on Monday occurred at The Sealife Centre, Brighton at around 4.30pm.
Fire alarms were activated and the buildings were evacuated on all three occasions. The fires were small, caused minimal damage and were extinguished by staff prior to the arrival of the fire brigade on all three occasions.
When staff returned to the buildings, having been given the all clear by East Sussex Fire and Rescue, it was discovered that money had been taken from tills left unattended.
A Bracknell man has been jailed for two years after pleading guilty to arson recklessly endangering life.
Roderick Lewis, 58, from Mainprize Road, Bullbrook, pleaded guilty to the offence, which happened at his home earlier in the year.
On February 22 he poured petrol around the loft of the house, owned by a housing association, before lighting it. He then turned on the gas appliances and left the property.
Police and Berkshire firefighters discovered the roof of the property ablaze. The fire was, however, extinguished before it could spread any further.
DC Iain Watkinson said: “Lewis deliberately set this fire to his own house before leaving the property and walking off. His neighbours could have been seriously injured if the fire had spread.
“I am pleased with the sentence, which reflects the serious consequences Lewis’s crime could have had if not for the swift response.”
Father and son William and Ashley Cairns have been jailed for four years, and two years eight months respectively, for trying to burn down a supermarket at Ramsgate in Kent.
A father and son who were caught trying to set fire to a supermarket in Ramsgate have been jailed. William Cairns, 58, and his son Ashley Cairns, 24, tried to burn AMCO supermarket in Queen Street
They collected fuel cans, walked to the building and were seen by police pouring petrol into the shop.
A jury is continuing its deliberations into a second day in the trial of three people accused of murdering three generations of the same family in an arson attack at their home in Kent.
Danai Muhammadi, Emma Smith and Farhad Mahmud deny setting the home of Melissa Crook alight in September 2011.
Mrs Crook, her father Mark and young son Noah died as a result of the blaze in Chatham Hill in Chatham.
A jury has retired to consider its verdicts in the trial of three people accused of murdering three generations of the same family in an arson attack at their home in Kent.
Danai Muhammadi, 24, was the "principal figure" behind the arson attack which killed his estranged wife Melissa Crook, 20, and their 15-month-old son Noah at Chatham Hill in Chatham, it is alleged
Mrs Crook's father, Mark Crook, 49, was left critically ill with severe burns in hospital in East Grinstead, West Sussex, he died six days later. The tragedy happened after petrol was squirted through the letterbox of the family home. Flames cut off any escape route for the family.