Police investigating three fires in four days in Corby have appealed for witnesses to come forward.
Two people required hospital treatment over the weekend after inhaling smoke from a fire started in rubbish outside a house.
The three fires took place between Thursday, June 12 and Sunday, June 15.
The first incident saw a wheelie bin and a pile of rubbish set alight outside a house in Lingfield Walk, at about 11.30pm on June 12.
On Saturday, June 14, a temporary office building at Bizzy Bees Minibus Hire in St James Road was destroyed in a blaze which began at about 2.30am.
There were no injuries sustained during either of the two fires.
Meanwhile, four people were forced to escape from a house in Llewellyn Walk at 2.30am on Sunday, June 15, after rubbish outside was set on fire. One of those who escaped, along with a neighbour who came to help, was taken to Kettering General Hospital to receive treatment for smoke inhalation.
The fire also damaged both the inside and outside of the property.
Officers investigating the three fires do not at this stage believe they are linked but have urged anyone with any information to call 101 or Crimestoppers anonymously on 0800 555111.