Four people who died after a house fire that took place in Brent in the early hours of Saturday morning have been named by police. Nusrat Usman, 43, Maryam Mikaiel, 15, Musa Usman, eight, and Raees Usman, four, died when the house in Stonebridge, north-west London went up in flames, the Metropolitan Police said. A 13-year-old girl, who has not been named, remains in hospital in critical condition while a woman in her 70s has been discharged. A man, 41, was arrested on suspicion of murder outside the property. He has since been bailed and detained under the Mental Health Act, the Met said. Officers were called to Tillett Close at around 01:20 BST on Saturday, attending alongside the London Fire Brigade (LFB). Two terraced three-storey homes were gutted in the fire. Eight fire engines and about 70 firefighters from stations across Wembley, Park Royal and Willesden were sent out to tackle the blaze. On Sunday, flowers and teddy bear tributes were seen laid near the properties. Supt Steve Allen, from the local policing team, said on Sunday that specialist officers were supporting the family. "Our thoughts go out to all those impacted by what has happened," he said. "Local officers are working closely with officers from the Specialist Crime Command on what continues to be a very complex investigation." Extra officers will also be deployed to the area in the coming days, he added.