Six fire engines and 35 firefighters and officers have been called to reports of a fire at a building site near Kings Cross.
London Fire Brigade said the blaze is now under control.
Part of a south facing wall at the building site in Balfe Street in Islington was alight. One person self evacuated from the cab of a 30 metre crane, London Fire Brigade said.
The Brigade’s 999 control officers have taken more than 20 calls to reports of the blaze, after first being called at 12:06. Fire crews from Islington, Kentish Town, Holloway, Paddington and Lambeth fire stations are at the scene.
The cause of the fire is currently unknown.
Witness said nearby offices had been evacuated.
Twitter users posted photos from the scene:
Seems like London's Fire brigade have it under control at kings Cross- the building site went up fast, potentially an overheating generator pic.twitter.com/1vZ29Xv2PD— Laurence KC, Pavegen (@LaurenceKC) May 25, 2017
Kings Cross - fire near York Way, now under control, roads being closed off. pic.twitter.com/zF9Lvsohim— Sylvia Upton (@supton63) May 25, 2017
Big fire Kings Cross ways. Hope crane man OK. pic.twitter.com/urdKUVuygD— Michael McCormack (@fringe64) May 25, 2017