Olivia Uffindell: Toddler killed after her buggy was blown by a gust of wind into the path of a van as her mother Louise locked the front door Olivia Uffindell died after her pushchair was blown into traffic as mother Louise, a nursery worker, turned to lock the front door Three-year-old girl suffered cardiac arrest and died an hour later Desperate mother tried to give CPR at the scene of the accident Courier van driver held on suspicion of causing death by careless driving A three-year-old was killed in front of her mother this morning when a gust of wind blew her buggy from her doorstep into the path of a delivery van, according to witnesses. Olivia Uffindell, was hit by a van driving into an estate off Wellesley Road in Croydon town centre, South London, after her mother Louise let go 'for a second' to lock her front door. Paramedics from London's Air Ambulance raced to the scene and Olivia was taken by road ambulance to St George's Hospital, Tooting. Olivia, pictured with mother Louise Uffindell, died when her buggy was apparently blown in front of an oncoming van She died just over an hour later after suffering a cardiac arrest. The driver of the white Mercedes van has been arrested on suspicion of causing death by careless driving and was taken to a south London police station, a Metropolitan Police spokesman said. He was later released on bail until a date in May. Mother-of-one Sabrina Serrette, 33, said that Louise had worked at a day care centre which Olivia had also attended. She said: 'Louise is lovely and her little girl was so beautiful. I have a two-year-old daughter and we've chatted about our kids in the past. Her girl had gorgeous blonde hair, it was icicle white. Louise is a single mum and works for a daycare centre, the same one her little girl goes to. I am really shocked. It's so tragic. My heart goes out to Louise. A man who was at the scene within moments of the fatal collision said a gust of wind blew the girl's buggy into the path of a delivery van. 'I think they were off to playschool,' said the man, who is a neighbour of the girl's family. The mother turned around for a second to lock the door and the buggy was blown into the path of the van and the little girl was in it. Ongoing investigation: Police remove evidence from the flat where the girl lived. The driver of the van which hit her has been arrested on suspicion of causing death by careless driving A view of the scene: The child is thought to have been hit next to the green bollard just outside her home Mourning: A woman leaves a bunch of flowers outside the home of the young girl killed this morning The mother was trying to resuscitate her and was blowing air into her nose. At one stage she screamed "She's dead, she's dead," but I saw the girl's lips moving and told her to keep on blowing. It was a horrible scene. The family are very nice and she is a lovely little girl. It is tragic what has happened. Emergency services rushed to the scene after the collision at about 8.45am this morning. Paramedics then called police to the scene at 8.52am where the driver of the DPD courier van was arrested. Despite the efforts of medics on the scene and at St George's, the girl was pronounced dead at 10.03am. Witness William Messer, 72, said: 'I saw the helicopter touch down on the school playground behind the estate. There were lots of police cars and the road was cordoned off all morning. It's terrible.' Another neighbour, who did not want to be named, said he saw the little girl after she had been hit by the car. I came out after hearing some noises and saw the buggy which had been crushed. I saw the little girl and she looked like she was in a bad way. Her mum was screaming. She said she had left her in her buggy outside her house for a few moments while she went back inside to get something. She said the wind had pushed the buggy over and a van has crashed into her. 'It's so sad. They are a nice family. They've lived here for two years.' Officers from the Road Death Investigation Unit at Catford Traffic Garage are investigating the circumstances of the collision, a police spokesman said. Police would not answer further questions about what happened because the circumstances were 'still under investigation.' They said the girl's next of kin has been told. Tragic: Wellesley Road in Croydon town centre, South London, near where a three-year-old girl was killed today when a gust of wind blew her buggy into oncoming traffic The tragedy stopped traffic in one direction on the busy dual-carriageway in west Croydon for several hours this morning. Twitter users also reported hold ups with the district's tram network at around the time of the incident. A London Ambulance Service spokesman added: 'We were called at just before 8.45am to reports of a road traffic collision on Wellesley Road. 'We sent a single responder in a car, an ambulance crew, a duty officer and London's Air Ambulance to the scene. Our staff treated one patient, a girl reported to be three-years-old, who was in cardiac arrest. 'She was taken to St George's Hospital in an ambulance, escorted by the doctor from the air ambulance.' Delivery firm DPD confirmed to the Croydon Advertiser that one of its vehicles was involved in the incident. 'Our deepest sympathy goes to the family involved and we will continue to work closely with the emergency services investigating the incident,' a spokesman said. A Scotland Yard spokesman said: 'The driver of the white Mercedes Sprinter panel van stopped at the scene. Officers from the Road Death Investigation Unit at Catford are investigating the circumstances of the collision. The 36-year old-driver was arrested on suspicion of causing death by careless driving and was taken to a south London police station. He has since been bailed to return pending further inquiries on a date in early May.