Detectives investigating the death of a three-year-old girl are assessing whether a gust of wind blew her buggy in front of the van that killed her.
Olivia Langley died in the accident in Croydon, south London, at about 08:45 GMT Monday morning.
Witnesses reported seeing Olivia's pushchair being blown into the street, in Wellesley Road, just before it was hit by the van.
Olivia was pronounced dead at St George's Hospital just after 10:00 GMT.
Her mother, named as Louise Uffindell, 29, had left the pushchair as she went to fetch something from inside the house, witnesses have said.
Police said the driver, who stopped at the scene, was arrested on suspicion of causing death by careless driving.
He will return to a south London police station in May.
A police spokesman said that the possibility that the pushchair was blown into the path of the van "will form part of our investigation".
Formal identification and a post-mortem examination are due to be carried out, he added.
Flowers have been left outside the family's home.
Resident Temi Ismail-Sobogun, 22, who has a two-year-old son, said: "She was a beautiful little girl.
"I'm gripping on to my son's pram now every moment. Even the wind coming along the road today shows how easy it must have been to just go into the road."
Another neighbour, Glenford Evans, said Ms Uffindell was a "lovely mother".
"Everyone's really devastated by it," she said. "We just hope it's something that doesn't happen again to anyone.
"She was a beautiful little girl. Very quiet, very friendly. It's just absolutely awful."