A post mortem on British singer Amy Winehouse, who was found dead at the weekend, has failed to find a cause of death.
The singer, who was 27, who has fought drug and alcohol addictions, was found dead at her north London home on Saturday afternoon.
More toxicology tests were being carried out and the results are expected in two to four weeks.
Amy Winehouse is best known for the single Rehab and her struggle with alcohol and drug addictions was well documented.
Her father Mitch Winehouse visited the growing shrine outside the singer's house and thanked fans, saying it meant so much to his family.
Surrounded by television crews and well-wishers, he read the dozens of condolence messages and walked along banks of teddy bears, flowers - and the occasional bottle of vodka - left by fans of the troubled singer.
Winehouse's battle was most famously documented in one of her best-known songs Rehabin which she sang, "They tried to make me go to rehab but I said no, no, no."
The singer's death has sparked a surge in demand for her music. British music retailer HMV predicted on Monday that she would be number one next week as sales of Back to Black, which won five Grammys, continue to grow.
