Two men have been charged with robbery and administering a noxious substance after an incident at Heathrow airport on Sunday.
Tyrone Richards, 31, and Anton Clarke-Butcher, 24, have each been charged with two counts of robbery and two counts of administering a noxious substance, HM Courts and Tribunal Service staff said.
They are due to appear at Uxbridge Magistrates’ Court on Tuesday.
On Monday, the Metropolitan Police said it had arrested two more people in relation to the incident, including a 23-year-old woman on suspicion of conspiracy to commit robbery.
It said a 31-year-old man, who had been arrested close to the scene, had since been released under investigation while inquiries continue.
Police were called to a multi-storey car park opposite Terminal 3 at 8.11am on Sunday after receiving reports that a number of people had been injured by a noxious substance.
London Ambulance Service treated 21 people, and five people were taken to the hospital, but have since been discharged. Among those injured was a three-year-old child.
Prior to the assault, two women were robbed of their suitcases after getting out of the car park lift. The men who robbed them sprayed a substance believed to be pepper spray in the direction of the women, which then affected others nearby.
Witness Tom Bate said he had been waiting to be picked up from the car park when he saw “young men dressed in black darting through the crowd”.
Mr Bate told the BBC that he felt a burning at the back of his throat after they left, with other people nearby beginning to cough.
“I’m so glad to hear now that it’s not terrorism because it felt like I was in the middle of an attack – it was pretty intense,” he said.
The assault sparked chaos for many travellers as several trains and buses to the airport were delayed and people reported being stuck at airport bus stops for hours.
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