The Metropolitan Police have provided an update regarding a serious incident at Heathrow Airport this morning. Officers were alerted at 8.11am on Sunday to a multi-storey car park at Terminal 3, following reports of an assault involving a group of individuals. Armed officers swiftly responded to the scene and arrested a 31-year-old man, who is currently in police custody. The London Ambulance Service treated 21 people for injuries, including a three-year-old girl who received care at the scene. Five individuals were subsequently taken to hospital, although their injuries are not considered life-changing or life-threatening. According to the police, the incident appears to have stemmed from a robbery. A woman was reportedly targeted by a group of four men who stole her luggage. During the incident, the suspects allegedly used a substance believed to be pepper spray against her. This altercation took place in a car park lift, affecting both those inside the lift and bystanders in the vicinity. Met Police Commander Peter Stevens stated, "Our team have been working at pace today to review CCTV from the area and speak with witnesses at the scene. At this stage, it's understood that a woman was robbed of her suitcase by a group of four men, who sprayed a substance believed to be pepper spray in her direction." He further noted, "We do believe this to be an isolated incident with those directly involved known to each other." The incident has understandably caused concern among passengers. By midday, many were seen waiting at the terminal's bus stop for shuttles to the long-stay car park and other locations. One family, who chose to remain anonymous, reported waiting for three hours after their flight landed around 8am. In response to the situation, Heathrow staff distributed bottled water to passengers waiting at the bus stop. A spokesperson for Heathrow explained, "The shuttle buses to the long-stay car park were impacted by congestion on the roads following an earlier incident which saw the Central Terminal Area tunnel closed for safety reasons. The buses are now operating as normal and we apologise for any inconvenience caused." Rail passengers at the Heathrow Terminal 2/3 station also experienced delays and long queues due to overcrowding. The police are urging anyone with information about the incident to contact them by calling 101 and quoting CAD 1803 7 DEC.