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Two more people have been arrested related to a theft at London's Heathrow Airport where 21 people were injured 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 detained for suspected conspiracy to commit robbery. Both individuals are still being held, authorities confirmed.

These detentions come after an investigation into an assault at the multi-storey car park at Heathrow's Terminal 3 on Sunday. Prior to 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 those hurt in the event. A total of five individuals went to hospital for treatment and have since been discharged.

Police arrested a 31-year-old man for suspected theft and assault near the scene. He has since been released pending further inquiries as the investigation proceeds.

Police were alerted at about 8:10 in the morning GMT after reports came in regarding a number of individuals hurt by an irritating chemical thought to be an irritant spray.

The assault - which police said was isolated and not being treated as terrorism - resulted in train delays and the temporary shutdown of the Central Terminal Area tunnel and the T3 car park briefly.