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An additional two individuals are now in custody in connection with a robbery at London's Heathrow Airport in which 21 people sustained injuries by a substance believed to be an irritant spray, as stated by law enforcement.

A man, 24, was taken into custody in the Lambeth area on suspicion of theft and assault and a 23-year-old woman was arrested for suspected conspiring to commit a robbery. They both remain in custody, authorities confirmed.

These detentions follow an investigation into an attack at the multi-level parking garage at Heathrow's Terminal 3 on Sunday. Before the incident, a pair of female travelers were robbed of their luggage after getting out of a parking garage elevator.

A three-year-old girl was among the injured in the event. A total of five individuals were taken to the hospital for treatment and were later released.

Police detained a man in his thirties on suspicion of theft and assault near the scene. He has since been released under investigation as the investigation proceeds.

Authorities were called at approximately 08:10 GMT after reports came in regarding several people hurt by an irritating chemical thought to be an irritant spray.

The assault - which authorities stated was isolated and not being treated as an act of terror - caused delays to rail services and the partial closure of the main airport tunnel and the Terminal 3 parking facility briefly.