![Police and rescue services operate near the fire at the Grenfell Tower apartment block in North Kensington, London, on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-9.jpg?quality=85&w=2400)
Londoners watched in shock as a 24-floor residential tower was transformed into an urban inferno early Wednesday.
Flames engulfed the Grenfell Tower, in west London’s North Kensington neighborhood, starting at around 1 a.m. local time, and the high-rise apartment complex continued to burn for more than four hours.
The Associated Press reports that 45 fire engines and more than 200 firefighters rushed to the scene to respond. At least 50 people were taken to hospitals, according to the London Ambulance Service, amid fears that others may have been trapped inside.
The city’s Mayor Sadiq Khan said on Twitter that the blaze is being treated as a “major incident.” Emergency responders are still on the scene.
London Fire Brigade Commissioner Dany Cotton confirmed at a televised press conference that there were a number of fatalities, but the death toll is still unclear. The cause of the fire is still unknown.
This is a developing story, please check back for updates.
![Flames and smoke billow as firefighters deal with a serious fire in a tower block at Latimer Road in West London on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-8.jpg?quality=75&w=2400)
![Flames and smoke billow as firefighters deal with a serious fire in a tower block at Latimer Road in West London on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-5.jpg?quality=75&w=2400)
![A man peers out of a window from a building on fire in West London on June 14, 2017. The blaze, which ignited overnight, was burning well after the sun rose as some 200 firefighters battled the flames.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-3.jpg?quality=75&w=2400)
![Police and rescue services operate near the fire at the Grenfell Tower apartment block in North Kensington, London, on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-9.jpg?quality=75&w=2400)
![Smoke rises from a high-rise building that caught fire overnight in West London on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-4.jpg?quality=75&w=2400)
![Smoke rises from the fire at the Grenfell Tower apartment block in North Kensington, London, on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-11.jpg?quality=75&w=2400)
![A man stands amid debris after a serious fire in a tower block at Latimer Road in West London on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-6.jpg?quality=75&w=2400)
![Firefighters spray water into the smoldering frame of a high-rise that caught fire overnight in West London on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-7.jpg?quality=75&w=2400)
![Emergency personnel operate next to the fire at the Grenfell Tower apartment block in North Kensington, London, on June 14, 2017.](https://api.time.com/wp-content/uploads/2017/06/grenfell-tower-london-fire-10.jpg?quality=75&w=2400)
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