The family of Amy Winehouse gathered at a north London cemetery this afternoon to bid farewell to the 27-year-old, three days after the troubled singer was found dead at her home.

A post mortem on the ‘Back to Black’ singer, who died at the weekend, failed to determine how she died and more toxicology tests are being carried out, with the results expected in two to four weeks.

The autopsy was carried out after an inquest opened and adjourned on the 27-year-old's death, which police are so far describing as ‘unexplained’.

Ms Winehouse, who fought drug and alcohol addictions, was found dead at her north London home on Saturday afternoon.

As sales of her music soar and speculation swirls about the release of a possible posthumous album, her father Mitch flew in from New York and visited a shrine of flowers, gifts and cards outside the house.

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.

‘Thank you for coming,’ he said. ‘It means so much to me and my family.’

A sombre mood hung over Camden Square, where Ms Winehouse lived, as a constant stream of fans arrived to lay flowers and leave messages for the singer yesterday.

Some well-wishers were unable to hold back tears as they looked in near silence at fans' tributes.

Messages for the singer were left both by locals, including one saying she is ‘going to be thoroughly missed in Camden’, and by fans from as far afield as Colombia, Mexico, Italy and Spain.

Ms Winehouse's battle with alcohol and drugs was well documented, most famously in one of her best-known songs ‘Rehab’.

She won critical acclaim after the release of her debut album ‘Frank’ in 2003 before becoming a worldwide phenomenon with the success of 'Back to Black'.

The Daily Telegraph newspaper reported yesterday that material recorded before Winehouse's death could be released as a posthumous album, citing sources who said Winehouse had recorded ‘a lot of material’ and that her parents would have the final say on whether a new album is to be released.

Ms Winehouse's spokesman told Reuters news agency there was currently no confirmation of the release of a third album.

‘I know there's material about, but no one's talked about it,’ he said.

Her recording company, Island Records, a subsidiary of Universal Music Group had no comment about the possibility of a posthumous album.

The inquest will resume in October.