A pepper spray incident at Heathrow's Terminal 3 triggered a police response, lockdown, and arrests, causing ongoing travel disruptions.

A man was arrested after a pepper spray incident at Heathrow Terminal 3 on December 7, 2025, which prompted an armed police response and temporary lockdown. Several people were affected, but no life-threatening injuries occurred. Roads and rail lines have reopened, though travel delays persist, especially on the Elizabeth Line. Authorities confirmed the incident is not terrorism-related.