An additional two individuals are now in custody related to a robbery at London's Heathrow Airport where 21 people were injured by a substance believed to be an irritant spray, according to police.
A man, 24, was arrested in the Lambeth area for suspected theft and assault and a 23-year-old woman was arrested for suspected conspiracy to commit robbery. They both are still being held, the force said.
The arrests follow 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 suitcases upon exiting a parking garage elevator.
A three-year-old girl was one of the injured in the event. A total of five individuals were taken to the hospital for treatment and were later discharged.
Police 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 about 08:10 GMT after reports came in regarding a number of people injured by a noxious substance thought to be pepper spray.
The assault - an event that police said was a standalone incident and not considered an act of terror - resulted in delays to rail services and the temporary shutdown of the Central Terminal Area tunnel and the T3 car park briefly.
