London’s fire commissioner says there have been a number of fatalities in a high-rise fire in west London.

Commissioner Dany Cotton calls the fire an “unprecedented incident” and says she has never seen anything on this scale in her 29-year career. She says firefighters are still working and she can’t say how many people may have died. At least 30 people have been taken to hospitals.

Fire raced through the 24-floor Grenfell Tower in North Kensington around 1 a.m.