A man has been arrested after six people were hit by a car as they paid tribute to two boys killed by a train.
Jamie Yuksel and Voker Hasa were killed on Friday
The car mounted the pavement near the gates to Salisbury School in Edmonton, north London, on Monday afternoon.
Police said four students, a member of school staff and a parent were seriously injured. A 15-year-old girl is in a life-threatening condition.
Jamie Yuksel and Voker Hasa, both 16, were hit by the Stansted Express at Pegamoid Road, Edmonton, on Friday.
Police said a black Vauxhall Astra had crashed into a group of people looking at flowers left in memory of the two dead boys at about 1422 GMT.
A member of staff, together with the mother of a pupil and three male pupils, two aged 16 and one 15, were taken to hospital with serious injuries.
The driver of the car, who was in his 40s, was treated in hospital for minor injuries.
Det Supt Glyn Jones said it had appeared the car had gone on the wrong side of the road then, as it cut back, lost control and mounted the pavement knocking over the pedestrians.
Police are also appealing for anyone who saw a dispute involving a woman, who was driving a black VW Polo, and a man at the Hertford Road traffic lights shortly before the crash.
The car mounted the pavement
Head teacher at the school Martin Rainsford said they had been working with students and staff to help them come to terms with the deaths of the two boys when this "terrible accident" happened.
"We are still in a bit of a state of shock but we have been working with the emergency services and the police to try and work out what happened."
The road remained closed as police forensic experts carried our investigations.
Jamie and Voker were hit by a Stansted Express train on a foot crossing half a mile (800m) from Angel Road rail station.
Voker's "devastated" family visited the scene on Monday.
No warning lights
His cousin Marion Lluca said: "This is just a nightmare. The crossing is right next to a park. There are kids playing near. It should be protected."
The boys had been with three others on Friday night but they left the scene before emergency crews arrived.
Police have questioned two 16-year-old boys and one 15-year-old but want to speak to a cyclist seen riding across the crossing moments before the accident.
The driver of the Liverpool Street to Stansted Airport train said he sounded the horn and braked after seeing the boys on the track at 2110 GMT.
The gate is spring-loaded so can be pushed open by pedestrians, but the unattended crossing has no warning lights, according to British Transport Police.
The Health and Safety Executive has opened an investigation into the case.