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Two more people have been arrested related to a robbery at London's Heathrow Airport where 21 people sustained injuries by a substance believed to be an irritant spray, as stated by law enforcement.

A 24-year-old man, was arrested in the Lambeth area on suspicion of robbery and assault and a 23-year-old woman was arrested on suspicion of conspiracy to commit robbery. Both individuals are still being held, authorities confirmed.

The arrests come after a probe into an attack at the multi-level parking garage at Terminal 3 on Sunday. Before the incident, two women were robbed of their luggage after getting out of a car park lift.

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

Police detained a 31-year-old man for suspected theft and assault near the scene. He was subsequently released under investigation as the investigation proceeds.

Authorities were alerted at about 8:10 in the morning GMT after reports came in regarding several people injured by an irritating chemical believed to be an irritant spray.

The assault - which authorities stated was a standalone incident and not being treated as terrorism - caused delays to rail services and the partial closure of the main airport tunnel and the Terminal 3 parking facility briefly.