Four people including a seven-year-old girl were treated for smoke inhalation after a house fire being treated as suspicious by police.
Emergency services attended the blaze at a property in Milton Terrace, Hamilton, at 11.45pm on Sunday.
Two men, aged 40 and 46, and a 30-year-old woman were also treated by paramedics along with the young girl in the South Lanarkshire town.
The Scottish Fire and Rescue Service extinguished the fire and conducted a joint investigation with Police Scotland.
Detective Constable John Law said: “Thankfully no-one was seriously injured as a result of this cowardly act and it is vital that we trace the person or persons responsible.
“I’d like to speak to anyone who may have seen anything suspicious or witness a person or persons acting suspiciously in the vicinity of Milton Terrace.
“Anyone with information who could help us trace the person or persons responsible should contact police at Cambuslang via telephone number 101 quoting incident number 3879 of 13 January 2019.”