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Two more people have been arrested in connection with a robbery at London's Heathrow Airport where 21 people were injured by what is thought to be an irritant spray, according to 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 for suspected conspiracy to commit robbery. Both individuals are still being held, the force said.

These detentions follow a probe into an attack at the multi-storey car park at Heathrow's 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 three-year-old girl was among the injured in the event. A total of five individuals went to hospital for treatment and were later released.

Officers arrested a 31-year-old man for suspected robbery and assault close to the location. He was subsequently released under investigation while inquiries continue.

Authorities were called at approximately 8:10 in the morning GMT after reports came in regarding a number of people injured by a noxious substance believed to be pepper spray.

The attack - an event that police said was isolated and not considered terrorism - resulted in delays to rail services and the partial closure of the main airport tunnel and the T3 parking facility briefly.