Overview

• Emergency services were called around 5pm local time, prompting a precautionary evacuation of Terminal 4 check‑in and a halt to trains calling at the station.
• Paramedics treated 21 people, including one taken to hospital, with no life‑threatening or life‑changing injuries reported.
• Specialist officers from the Metropolitan Police and London Fire Brigade conducted searches and found no trace of any adverse substance.
• The terminal was declared safe and reopened shortly after 8:27pm, with some flights delayed and passengers temporarily waiting outside.
• Enquiries into the trigger are ongoing, with some media citing unconfirmed reports of a mass‑psychogenic event against the backdrop of other 2025 disruptions at Heathrow.