Firefighters are warning people about the dangers of fireworks after a fire in Alma Street, Stratford.
Two fire engines and 10 firefighters and officers were called to the fire in block of maisonettes.
The cause of the fire is believed to be a firework which was ignited in the hallway.
Crews managed to contain the fire to the hallway, but a four-roomed maisonette on the second and third floors was damaged.
A man suffering the effects of smoke inhalation was led to safety by crews wearing breathing apparatus.
He was treated at the scene and taken to hospital by London Ambulance Service crews.
A London Fire Brigade spokesperson said: “We’re approaching the time of year where we have to start reminding people about the dangers of fireworks.
“Fortunately, crews were able to stop this particular fire spreading any further and led a man to safety, but it could have had a very different outcome.
“Fireworks are explosive devices and are therefore very dangerous and should be used carefully.
“They can cause severe damage and permanent harm to others.”
The Brigade was called at 0556 and the fire was under control at 0637. Fire crews from Stratford and Leytonstone fire stations attended the scene.
The Met Police is treating the fire as arson and are appealing for any witnesses as to what happened.
Anyone with information is asked to Newham CID on 101 or tweet @Metcc.
To give information anonymously call Crimestoppers on 0800 555 111.
The Brigade is urging the public to attend organised firework displays this Bonfire Night.
However, for those planning on hosting their own event, always follow the Brigade's bonfire and firework safety advice, including:
• Only buy fireworks marked with the British Standard Kitemark BS7114
• Don't drink alcohol if setting off fireworks
• Keep fireworks in a closed box and always follow the instructions carefully when using them
• Light them at arms length using a taper and stand well back
• Never go back to them once they are lit. Even if a firework hasn't gone off, it could still explode
• Never throw fireworks and never put them in your pocket
• Respect your neighbours – don’t let off fireworks late at night and remember there are laws to follow
• Take care with sparklers – never give them to children under five. Even when they have gone out they are still hot so put sparklers in a bucket of water after use
• Keep your pets indoors throughout the evening