Two more people are now in custody in connection with a robbery at Heathrow Airport where 21 people were injured by a substance believed to be pepper spray, as stated by law enforcement.
A 24-year-old man, was taken into custody in Lambeth for suspected robbery and assault and a 23-year-old woman was detained on suspicion of conspiring to commit a robbery. They both are still being held, the force said.
The arrests come after an investigation into an assault at the multi-level parking garage at Terminal 3 this past Sunday. Before the attack, two women had stolen from them their luggage upon exiting a car park lift.
A three-year-old girl was one of the those hurt during the incident. Five people were taken to the hospital for treatment and were later released.
Officers arrested a 31-year-old man for suspected theft and assault close to the location. He has since been released under investigation as the investigation proceeds.
Police were called at about 08:10 GMT following reports of several people hurt 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 for a short time.
