An additional two individuals are now in custody related to a robbery at Heathrow Airport in which 21 people sustained injuries by what is thought to be an irritant spray, according to police.
A man, 24, was taken into custody in Lambeth for suspected theft and assault and a 23-year-old woman was arrested on suspicion of conspiring to commit a robbery. They both remain in custody, the force said.
These detentions come after an investigation into an attack at the multi-storey car park at Terminal 3 this past Sunday. Prior to the attack, two women had stolen from them their suitcases upon exiting a car park lift.
A three-year-old girl was among the injured during the incident. Five people went to hospital for treatment and have since been discharged.
Officers arrested a man in his thirties for suspected robbery and assault near the scene. He was subsequently released pending further inquiries as the investigation proceeds.
Police were called at about 08:10 GMT following reports of a number of people injured by an irritating chemical thought to be an irritant spray.
The attack - which police said was a standalone incident and not being treated as an act of terror - caused train delays and the partial closure of the main airport tunnel and the T3 car park briefly.
