Two more people have been arrested in connection with a theft at Heathrow Airport in which 21 people sustained injuries by a substance believed to be an irritant spray, according to police.
A man, 24, was taken into custody in Lambeth on suspicion of robbery and assault and a 23-year-old woman was arrested for suspected conspiring to commit a robbery. Both individuals are still being held, the force said.
The arrests follow a probe into an assault at the multi-level parking garage at Terminal 3 this past Sunday. Before the attack, two women were robbed of their suitcases after getting out of a car park lift.
A toddler aged three was one of the those hurt in the event. Five people went to hospital for medical care and were later released.
Police detained a 31-year-old man on suspicion of robbery and assault close to the scene. He has since been released under investigation as the investigation proceeds.
Authorities were alerted at about 8:10 in the morning GMT following reports of several people hurt by an irritating chemical believed to be pepper spray.
The assault - an event that authorities stated was isolated and not considered terrorism - caused train delays and the temporary shutdown of the main airport tunnel and the Terminal 3 car park for a short time.
