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Police arrested a 31-year-old man Sunday at a London airport following a robbery in which 21 people — including a 3-year-old child — were pepper-sprayed and required medical treatment, officials said.

The morning incident happened at Heathrow Airport’s parking garage when a group of four men stole a woman’s suitcase in an elevator and sprayed an irritant at her, the Metropolitan Police said.

“A woman was robbed of her suitcase by a group of four men, who sprayed a substance believed to be pepper spray in her direction,” Commander Peter Stevens said in a statement, adding that passengers in the elevator and surrounding area were also affected.

Police said the suspects then fled the elevator following the incident. They appeared to be three you

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