Grenfell Tower: What happened
The fire which destroyed Grenfell Tower in June 2017 was one of the UK's worst modern disasters.
Just before 01:00 on 14 June, fire broke out in the kitchen of a fourth floor flat at the 23 storey tower block in North Kensington, West London.
Within minutes, the fire had raced up the exterior of the building and then spread to all four sides. By 03:00, most of the upper floors were well alight.
Seventy-two people died. Here is how events unfolded that night.
How the fire started
The fire began "in or around" a Hotpoint fridge-freezer in flat 16 on the fourth floor, according to a provisional report by Dr Niamh Nic Daéid, director of the Leverhulme Research Centre for Forensic Science at Dundee University.
Her report contains extracts from a witness statement by flat occupant Behailu Kebede, who described being woken by the sound of a smoke alarm.
He went into the kitchen and saw smoke in the area of the fridge-freezer and near the kitchen window.
Mr Kebede immediately called the fire brigade, which logged the call at 00:54. Four fire engines were sent to the scene, the first arriving at 00:59.
The first fire crew entered the flat at 01:07 - an approximate timing taken from a thermal imaging camera. They initially searched the bedrooms and did not enter the kitchen until 01:14.
In the kitchen, firefighter Daniel Brown described seeing an "isolated curtain of flame from about 2-3 feet in the air to the ceiling".
Thermal images captured by the fire crew appear to show that "hot fire gases and flames had spread across the window space".
As the fire crew dealt with the fire in the fridge-freezer, their thermal images also appear to show falling embers outside the kitchen window.
Mobile phone images taken by Mr Kebede from outside Grenfell Tower approximately 11 minutes after his first 999 call show an orange glow of flames around the kitchen window, and later a fire burning more intensely in the area of the window filler panel and extractor fan.
Subsequent photos by Mr Kebede suggest that the "fire was continuing to develop and grow", Dr Nic Daéid reports, by 01:09 becoming "external to the building".
Although the timings provided are approximate, it appears that the fire had spread to the cladding before the firefighters had entered the kitchen.
Dr Nic Daéid's provisional report also identifies "unknown materials" stored between the freezer and wall which "may have become involved in the fire in the early stages of its development".
Among these materials was an item described as an "electric cooking device" or "large hot plate".
In another report, fire expert Professor Luke Bisby expressed his view that the likely reason for the fire spreading beyond the kitchen was that flame and hot gases penetrated the internal window frame.
How the fire spread
From the fourth floor, the fire spread rapidly upwards and across the eastern side of the building. From there, it spread across the north face of the tower.
Mobile phone videos show the blaze reaching the top floor on the east side of Grenfell Tower by about 01:26, less than 30 minutes after firefighters had arrived.
In a report to the Grenfell Public Inquiry, fire safety engineer Dr Barbara Lane identified the fire spreading vertically up the tower columns, and "laterally along the cladding above and below the window lines (and) the panels between windows."
The fire had spread to the north side of the tower by 01:42, Dr Lane recorded.
At 01:52, the fire also began travelling across the eastern side towards the south in the other direction.
At 02:06, London Fire Brigade declared the fire a "major incident". At this point, some 40 fire engines were either at or en route to the scene.
Grenfell Tower had a 'stay put' fire policy - essentially, the building design would contain a fire in a single flat for as long as it took fire crews to bring it under control.
So on the night, many residents were told to remain in their flats by the emergency services, only to become trapped as the fire blazed out of control and thick poisonous smoke spread up the single narrow stairwell.
Dr Lane said that the stay put policy had "substantially failed" by 01:26 - less than 30 minutes after the first firefighters were at the scene.
Some people ignored the stay put advice and made it down the stairs to safety.
A total of 65 people were rescued from the building by firefighters.
But in desperation, other residents went upwards and sought refuge in flats of friends and neighbours on the upper floors. Twenty-four people died on the top floor of the tower block.
By 02:10, multiple internal fires could be seen burning inside the building.
At 02:22 fire had spread to the south side of the tower and by 02:30 it was reported that the eastern side of the building was "fully involved in fire".
The stay put advice was finally abandoned at 02:47, when the incident commander gave the order to "advise people to make efforts to leave the building."
Counsel to the Grenfell inquiry Richard Millet QC told the 4 June 2018 hearing that 144 people managed to evacuate before 01:38, but only 36 after the stay put guidance was abandoned.
By 02:51, the fire had reached the western side. At this point, some 63 flats were on fire and more than 100 people remained in the building.
At 04:30 the whole building was engulfed, with more than 100 flats on fire.
The blaze did not burn itself out until 01:14 BST on Thursday - 24 hours later.
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