A fire at a three-storey building in south Belfast is believed to have been started "deliberately".
The fire service were notified of a building on fire on University Road shortly after 1am on Tuesday morning.
At its height, nine appliances and 55 firefighters were at the scene including a specialist command unit and aerial appliance.
Fire crews remained at the scene and at 11.07am, the fire reignited.
A spokesperson said: "Firefighters are working hard to extinguish the fire and the incident is ongoing.”
SDLP Cllr Gary McKeown said: "It is deeply worrying that this blaze is being treated as arson.
"Thanks to the hard work of firefighters throughout the night, the fire has been brought under control, but this could've easily proved fatal as there are many homes and businesses in close proximity, and it could've spread in what is a very built up area."