Officials say the cause of Prince's death may not be made public for weeks.
The Midwest Medical Examiner's Office says a post-mortem is taking place on the 57-year-old's body, after he was found dead at his Minnesota home yesterday.
The entertainment website TMZ is reporting the singer-songwriter was treated for a drug overdose days before he died.
The 57 year old was found unresponsive in a lift at his Paisley Park complex in Minneapolis on Thursday.
Anna Meacham at Purple PR, Prince's UK publicist, said "It is with profound sadness that I am confirming that the legendary, iconic performer, Prince Rogers Nelson, has died at his Paisley Park residence at the age of 57."
BREAKING: Publicist: Pop music superstar Prince has died at his home in suburban Minneapolis.
— The Associated Press (@AP) April 21, 2016
The singer was hospitalized six days ago with flu symptoms, after he fell ill on board a flight which was forced to land in Illinois.
Prince performed in Atlanta last Thursday night.
Here's his iconic performance of Purple Rain at the 2007 Superbowl.
Tributes have been pouring on Twitter.
A bridge in the singer's hometown of Minnesota was lit up in purple last night.
The I-35W Bridge in Minnesota will be lit in purple tonight in honor of Prince. https://t.co/u4gj03m9ds pic.twitter.com/PEgmORrLjE
— ABC News (@ABC) April 21, 2016
The Forum in Los Angeles was also lit up along with Niagara Falls.
The Forum in Los Angeles is all lit up tonight in Prince's honor. https://t.co/Pl8MoFN5U8 pic.twitter.com/Dym997GglU
— ABC News (@ABC) April 22, 2016
Niagara Falls lit up in purple for the Queen's 90th birthday, coincidentally the same day Prince passed away. ☔ï¸ðŸ’œ pic.twitter.com/fp2u8qMftZ
— 98FM (@98FM) April 22, 2016
A huge Prince block party was held outside Minneapolis' First Avenue club.
Aerial video shows huge crowd at Prince block party outside Minneapolis' First Avenue club. https://t.co/2aRJUh5K4Xhttps://t.co/wXQwu3lqxt
— ABC News (@ABC) April 22, 2016
Film-maker and long-time Prince collaborator Spike Lee held an impromptu street party in Brooklyn last night:
Snapchat has introduced a Purple Rain filter.
And @Snapchat has a purple rain filter. pic.twitter.com/Ate7QQmF3K
— Chris Harrington â“‹ (@chrisharrington) April 21, 2016
Meanwhile, Google has a Purple Rain doodle.
NASA posted a beautiful purple nebula in honour of Prince.
A purple nebula, in honor of Prince, who passed away today. https://t.co/7buFWWExMw pic.twitter.com/ONQDwSQwVa
— NASA (@NASA) April 21, 2016
