The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per the source: "a high-rise fire broke out in the 24-storey Grenfell Tower".
The London Fire Brigade's own page states 'On 14 June 2017 a fire broke out at Grenfell Tower... killing 72 people' - an exact match for the pin's stored date.
Wikipedia confirms the fire broke out '14 June 2017... at 00:54 BST' - an exact match for the pin's stored date.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most. A picture that shows something else, or shows it badly, is looked at too, and moved down or replaced.