Man arrested after Heathrow evacuation
20 people were treated by paramedics
Police investigating reports of hazardous materials, which triggered the evacuation of Heathrow Terminal 4 yesterday have made an arrest.
A cannister thought to contain a chemical spray was found, and 20 people were checked over by paramedics.
A 57-year-old man is being questioned on suspicion of possession of a firearm and causing a public nuisance.
The incident is not being treated as terrorism related.
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