Amy Winehouse Cause of Death: "Unexplained"

Amy Winehouse's cause of death is, as of this moment anyway, still being classified as "unexplained" by Scotland Yard. The singer died Saturday at 27.

Police issued a statement saying, "At this early stage it is being treated as unexplained and there have been no arrests in connection with the incident."

Ever since officials pronounced Amy Winehouse dead, they have been "operating under the suspicion" it was a drug overdose that led to her demise.

However, there is no concrete proof of that ... yet.

Scotland Yard said yesterday that, "Police were called by London Ambulance Service to a house in Camden Square NW1 shortly before 16.05 hours on Saturday 23 July, following reports of a woman found deceased."

However, a TMZ report suggests that when paramedics arrived, there were still "signs of life," although Amy died before she could be transported.

There is no information on who alerted the police.

The autopsy, originally scheduled for today, is now slated for Monday. It may show clearer signs of what killed Amy, but right now, we don't know