An additional two individuals are now in custody related to a theft at London's Heathrow Airport where 21 people were injured by what is thought to be an irritant spray, according to police.
A man, 24, was arrested in the Lambeth area on suspicion of robbery and assault and a 23-year-old woman was arrested for suspected conspiring to commit a robbery. They both remain in custody, the force said.
The arrests come after a probe into an attack at the multi-storey car park at Terminal 3 on Sunday. Before the incident, a pair of female travelers were robbed of their luggage upon exiting a parking garage elevator.
A toddler aged three was one of the those hurt during the incident. A total of five individuals went to hospital for treatment and have since been released.
Officers detained a 31-year-old man on suspicion of robbery and assault close to the location. He has since been released pending further inquiries as the investigation proceeds.
Police were alerted at approximately 08:10 GMT following reports of a number of individuals injured by a noxious substance thought to be pepper spray.
The assault - an event that authorities stated 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 parking facility briefly.
