Police are treating a fire at a flat on the fourth floor of a block in Worthing as arson.
Fire crews were sent to tackle the blaze around 10.30am yesterday (Thursday, 22) which happened at the Victoria Court building in Clifton Road.
Police said no-one was injured following the incident, but a criminal investigation has since been launched due to the origins of the fire being unexplained.
Anyone with information is asked to report it online here, or call 101, quoting Operation Hornbeam.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.