- Heathrow Airport's Terminal 4 was evacuated on Monday evening following a possible hazardous materials incident.
- The London Fire Brigade deployed specialist crews to the scene after being called at 17:01.
- The airport advised passengers not to travel to Terminal 4, with colleagues assisting those already present.
- National Rail Enquiries confirmed that trains were unable to call at Heathrow Terminal 4 due to the incident.
- All other terminals at Heathrow, the UK's busiest airport, continued to operate as normal, with only one flight from Terminal 4 experiencing a delay.
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