Overview
- Armed officers were called at about 8:11am to the Terminal 3 multi‑storey car park and arrested a man on suspicion of assault, with enquiries continuing to trace other suspects.
- London Ambulance Service treated 21 people at the scene and took five to hospital, with injuries not believed to be life‑threatening; the service was stood down late morning.
- London Fire Brigade provided specialist assistance and said firefighters remained at the scene during the response.
- Traffic and public transport faced significant disruption, including a temporary Heathrow Tunnels closure and delays to rail and Underground links, though services later reopened with residual delays.
- Police increased patrols at the airport and appealed for witnesses to call 101 quoting CAD 1803 7 DEC, as social‑media video showed a suspect being detained by officers.