An additional two individuals are now in custody in connection with a theft at London's Heathrow Airport in which 21 people sustained injuries by what is thought to be an irritant spray, according to law enforcement.
A 24-year-old man, was arrested in Lambeth on suspicion of robbery and assault and a 23-year-old woman was detained for suspected conspiring to commit a robbery. They both are still being held, the force said.
The arrests come after a probe into an attack at the multi-level parking garage at Heathrow's Terminal 3 this past Sunday. Prior to the incident, two women were robbed of their suitcases after getting out of a car park lift.
A three-year-old girl was among the injured during the incident. Five people went to hospital for treatment and were later released.
Police detained a man in his thirties on suspicion of theft and assault near the scene. He was subsequently released pending further inquiries as the investigation proceeds.
Authorities were alerted at approximately 08:10 GMT after reports came in regarding a number of people injured by an irritating chemical believed to be an irritant spray.
The attack - which authorities stated was isolated and not being treated as terrorism - resulted in train delays and the temporary shutdown of the main airport tunnel and the T3 car park briefly.
