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An additional two individuals have been arrested in connection with a robbery at Heathrow Airport in which 21 people sustained injuries by a substance believed to be pepper spray, according to law enforcement.

A 24-year-old man, was taken into custody in Lambeth for suspected theft and assault and a woman, 23 was arrested for suspected conspiracy to commit robbery. Both individuals remain in custody, authorities confirmed.

These detentions come after an investigation into an attack at the multi-level parking garage at Terminal 3 this past Sunday. Before the attack, a pair of female travelers had stolen from them their luggage after getting out of a parking garage elevator.

A three-year-old girl was one of the those hurt in the event. Five people were taken to the hospital for medical care and have since been discharged.

Police arrested a man in his thirties on suspicion of robbery and assault near the scene. He has since been released under investigation while inquiries continue.

Authorities were called at about 8:10 in the morning GMT following reports of several people hurt by an irritating chemical thought to be an irritant spray.

The attack - an event that police said was a standalone incident and not being treated as an act of terror - caused delays to rail services and the temporary shutdown of the main airport tunnel and the Terminal 3 parking facility for a short time.