An additional two individuals have been arrested related to a theft at Heathrow Airport in which 21 people were injured by what is thought to be pepper spray, according to police.
A 24-year-old man, was arrested in the Lambeth area for suspected robbery and assault and a woman, 23 was arrested on suspicion of conspiracy to commit robbery. They both are still being held, the force said.
These detentions come after a probe into an attack at the multi-storey car park at Heathrow's Terminal 3 this past Sunday. Prior to the incident, a pair of female travelers were robbed of their luggage after getting out of a car park lift.
A three-year-old girl was among the injured during the incident. A total of five individuals were taken to the hospital for treatment and were later discharged.
Officers arrested a man in his thirties for suspected robbery and assault near the scene. He was subsequently released under investigation while inquiries continue.
Police were called at approximately 08:10 GMT following reports of several people hurt by an irritating chemical thought to be an irritant spray.
The assault - which authorities stated was a standalone incident and not considered an act of terror - caused delays to rail services and the partial closure of the main airport tunnel and the T3 car park for a short time.