Firefighters from Tyne and Wear Fire and Rescue Service (TWFRS) were alerted to the incident on South Street in Newbottle just before 1.50pm on Friday, January 7.
Within just five minutes of receiving the emergency call, the first appliance from the Fire Service was at the scene to tackle the blaze.
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Firefighters have had to use an aerial ladder platform in order to tackle the blaze – with smoke spotted coming out of the roof of the property.
A Tyne and Wear Fire and Rescue Service spokesperson said: “We can confirm that five crews including an aerial ladder platform are currently in attendance of an ongoing incident at a residential property on South Street in Newbottle.
“The firefighters are from Rainton Bridge, Farringdon, Sunderland Central and Marley Park Community Fire Stations.
"The first appliance was on the scene within five-minutes of the initial call to our Fire Control team, which came in at 13:49.”
Northumbria Police have also confirmed that TWFRS alerted them to the fire, with officers still remaining at the scene on Friday evening.
A spokesperson for the Force added: “Shortly after 2pm today (Friday) we alerted by Tyne and Wear Fire and Rescue Service to a fire at an address on South Street in Newbottle.
“Emergency services remain at the scene.”