Sophie Ksher:

Sophie Ksher, from Arlesey in Bedfordshire, died a week after attending an illegal rave at a disused factory in Cressex, High Wycombe.

She had fallen during the night, hit her head and ended up in a coma.

Her family have urged anyone who was at the rave on 31 January to give police information about drug dealers.

Thames Valley Police said Sophie was among about 400 people at the rave.

The people who put my 16-year-old sister in an environment of drugs and alcohol need to be stopped to prevent other people from having to go through what we have Sophie's brother Mark

After hitting her head she was taken to Wycombe General Hospital where she fell into a coma.

The teenager, who had taken three ecstasy tablets, was then transferred to the Radcliffe Infirmary, Oxford, where she died on 6 February.

Sophie's brother Mark, 29, said on Wednesday he blamed drug dealers for her death.

"She was a victim of tragic circumstances, influenced by older people who did not care about her welfare," he said.

"The people who put my 16-year-old sister in an environment of drugs and alcohol need to be stopped to prevent other people from having to go through what we have.

"Our whole family still has not been able to come to terms with her death and can only hope Sophie realises that we never stopped loving her and never will."

Mark Ksher: "Sophie's cheeky little grin"

He added: "We will all remember our Sophie as the happy, loving, beautiful young girl who had the cheeky little grin that made everyone's heart melt.

"She loved being involved in sports activities at school, horse riding - she desperately wished that she would have a horse of her own one day - but most of all she loved spending time with her family and friends."

Det Insp Phillip Chandler said the injury to Sophie's head had been thought to be quite minor.

"We think she was knocked unconscious briefly and said she felt groggy," he said.

"She told paramedics and medical staff that she had taken some tablets.

Legal action

"And yet she seemed OK at that point. However, after that her condition apparently deteriorated."

Mr Chandler said the rave organisers would be facing legal action.

Sophie was one of a family of four sisters and two brothers.

Her parents Madaline and Mustafa, an aircraft technician, were too upset to talk publicly.

Anyone with any information about drug dealers at the event can contact the police on 0845 8505 505 or call Crimestoppers anonymously on 0800 555 111.