Firefighters are reminding people to be careful where they place glass ornaments and mirrors after another fire was caused by sunlight.
Six fire engines and 35 firefighters and officers were called to the fire at a maisonette in Plender Street, Camden.
A seven-roomed a maisonette on the ground and first floor was destroyed by the fire.
One man and one woman left the maisonette before the Brigade arrived and were treated for smoke inhalation by London Ambulance Service crews. Another woman left the adjoining property before the Brigade arrived and was taken to hospital.
The Brigade's fire investigators believe the cause of the fire was as a result of sunlight shining onto a concave mirror in the bedroom.
A London Fire Brigade spokesperson said: "These sort of incidents are not as rare as you would think. In the last five years we've seen over 100 fires caused by the sun's rays and this is the second one in a fortnight after sunlight reflecting on a shaving mirror set light to curtains in Fulham last week.
"Our advice is to make sure that you keep mirrors, crystals, glass ornaments and other reflective items out of direct sunlight at all times.”
The Brigade’s 999 Control Officers took13 calls to the fire.
The Brigade was called at 1406 and the fire was under control at 1538. Fire crews from Kentish Town, Euston, Lambeth, Holloway, Islington and surrounding fire stations attended.