Timeline information for all three incidents
| Incident location | Westminster Bridge | Manchester Arena | London Bridge |
| Incident date | 22 March 2017 | 22 May 2017 | 3 June 2017 |
| Incident time | 14:40 | 22:31 | 21:58 |
| First emergency call | – | 22:32 | 22:07 |
| First responder at scene | 14:46 | – | 22:13 |
| Major incident declaration (scene) | 14:51 (LAS) | 22:46 | 22:17 (police) 22:19 (LAS) |
| First casualty arrives at receiving hospital(s) | 15:23 (MTC) | 22:56 (TU) 23:04 (MTC) | 22:30 (TU) 22:44 (MTC) |
| First ambulance* arrives at receiving hospital | 15:30 (MTC) 15:37 (MTC) | 23:30 (MTC) 02:20 (TU) | 22:50 (MTC) 23:28 (TU) |
| All surviving casualties cleared from scene | – | 02:46 | 02:01 |
| Hospital stand-down | 18:30–19:30 | 05:25 | 02:40–05:14 |
*First casualty may have arrived already by other means.
LAS, London Ambulance Service; MTC, major trauma centre; TU, trauma unit.