A 66-year-old woman had to be taken to hospital after a fire was started in a block of Aberdeen flats.
Police and fire crews were called to Ash-Hill Drive in Aberdeen at about 1.50am in the early hours of Sunday morning.
The fire is reported to have been in the communal close of the building.
A 66-year-old woman was taken to Aberdeen Royal Infirmary to be checked following the emergency.
Police have now launched an investigation into the incident.
Detective Constable Keith Morrison said: “We have been carrying out inquiries in the area and I would urge anyone who witnessed anything suspicious in the area or who has any information that will help our ongoing investigation.”
Anyone with information should contact police by calling 101 with reference 0411 from March 20. Crimestoppers can also be called anonymously on 0800 555 111.