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An additional two individuals are now in custody related to a robbery at Heathrow Airport in which over twenty individuals were injured by a substance believed to be an irritant spray, according to police.

A 24-year-old man, was arrested in Lambeth on suspicion of 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, authorities confirmed.

The arrests follow a probe into an attack at the multi-storey car park at Terminal 3 on Sunday. Prior to the incident, two women had stolen from them their luggage after getting out of a parking garage elevator.

A toddler aged three was among the those hurt during the incident. A total of five individuals went to hospital for treatment and were later discharged.

Officers arrested a 31-year-old man on suspicion of robbery and assault near the scene. He was subsequently released pending further inquiries as the investigation proceeds.

Authorities were called at about 8:10 in the morning GMT after reports came in regarding a number of individuals hurt by a noxious substance believed to be an irritant spray.

The attack - which police said was a standalone incident and not considered terrorism - resulted in train delays and the partial closure of the Central Terminal Area tunnel and the T3 parking facility briefly.