A 26-year-old woman has been charged with the murder of a teenage girl who died after being stabbed in a park.

Hannah Bonser, of Cusworth House, Doncaster, has also been charged with two counts of possessing a bladed item.

She will appear before the town's magistrates on Thursday, February 16.

Casey-Lyanne Kearney (13) was attacked in Elmfield Park, Doncaster, just after one o'clock on Tuesday, February 14.

She managed to call police and a passer-by phoned for an ambulance, but despite their efforts she died in hospital hours later.

John Willis, who comforted the wounded youngster, said he was alerted by his two sons who saw her lying on the ground semi-conscious.

He said: "We got her in the recovery position. She didn't move a lot and she didn't speak. Her breathing was very shallow and she was very pale.

"The police arrived very promptly and took over the situation. I was very upset, it was very shocking."

Det Supt Terry Mann, of South Yorkshire Police, said officers were trying to establish Casey-Lyanne's movements after she left her home in Rossington at around midday on Tuesday.

He said she was intending to catch the bus to Doncaster town centre where she planned to meet a friend.

He appealed for any members of the public who were in or near the park at lunchtime on Tuesday and either saw anything suspicious or Casey-Lyanne herself to get in touch.

Det Supt Mann said two knives had been recovered at the scene.

He told reporters Casey-Lyanne's family had been left traumatised by the death.

He added: "They are a loving family. We have family liaison officers with the parents. It is a very, very sad case."

Elmfield Park remains closed to the public while police continue their investigation.