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Story summary
- A 57-year-old man was arrested at Heathrow Airport for allegedly carrying CS spray, prompting a three-hour evacuation of Terminal 4.
- Emergency services treated around 20 individuals for irritation symptoms after reports of a hazardous materials incident.
- Police initially suspected "mass hysteria" before finding the CS spray canister.
- The airport reopened at 8:30 PM, with minimal flight delays reported.
- Authorities confirmed no links to terrorism; the suspect remains in custody facing charges.
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