An additional two individuals are now in custody related to a theft at Heathrow Airport where 21 people were injured by what is thought to be pepper spray, as stated by police.
A 24-year-old man, was taken into custody in Lambeth for suspected robbery and assault and a 23-year-old woman was arrested on suspicion of conspiracy to commit robbery. Both individuals are still being held, the force said.
These detentions follow an investigation into an assault at the multi-storey car park at Terminal 3 on Sunday. Before the incident, two women were robbed of their suitcases after getting out of a car park lift.
A toddler aged three was one of the injured in the event. Five people went to hospital for medical care and have since been released.
Officers arrested a man in his thirties for suspected robbery and assault near the location. He has since been released pending further inquiries while inquiries continue.
Authorities were alerted at about 8:10 in the morning GMT after reports came in regarding several people injured by a noxious substance believed to be an irritant spray.
The attack - which authorities stated was isolated and not considered an act of terror - resulted in delays to rail services and the temporary shutdown of the main airport tunnel and the T3 car park briefly.