Prince Charles leads the tributes to American comedian Joan Rivers

Further tests will be needed to determine what exactly caused the death of the American comedian Joan Rivers, according to the New York City medical examiner.

The 81-year-old died on Thursday at Manhattan’s Mount Sinai Hospital. She had been in a coma since August 28, when she went into cardiac arrest during a routine throat procedure at a doctor’s office. Her funeral will be held today in New York. The services will be private.

Meanwhile, tributes to the influential comedian have poured in.

“Joan Rivers was an extraordinary woman with an original and indefatigable spirit, an unstoppable sense of humour and an enormous zest for life. She will be hugely missed and utterly irreplaceable.” – Britain’s Prince Charles, known for his love of comedy

“She was a real character. I am so upset by her passing. She was too young and had too much to do still.” – Barbra Streisand

"I'm completely heart-broken by the loss of my beloved Joan. Not only was she my boss, she was and will always be my teacher, therapist, closest friend, inspiration and the only grandmother I ever knew." – Rivers's Fashion Police co-star Kelly Osbourne.

“Here’s a woman, a real pioneer for other women looking for careers in stand-up comedy. And talk about guts – she would come out here and sit in this chair and say some things that were unbelievable. But it was hilarious. The force of her comedy was overpowering.” – David Letterman

“I never saw someone attack a stage with so much energy. She was a controlled lightning bolt. ... I looked up to her. I learnt from her. I loved her. I liked her. And I already miss her very much.” – Louis C K

“Every woman in comedy is indebted to her. She was there at the beginning and funny to the end. ” – Amy Poehler

“My heart is torn in half. She wasn’t done.” – the comedian Sarah Silverman

“Joan Rivers will always be a pioneer. She paved the way for a lot of comedians. I’m very sad she’s gone.” – Ellen DeGeneres

“Watching Joan Rivers do standup at age 81 was incredible: athletic, jaw-dropping, terrifying, essential. It never stopped. Neither will she.” – Lena Dunham

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FFP EXPLAINED

What is Financial Fair Play?
Introduced in 2011 by Uefa, European football’s governing body, it demands that clubs live within their means. Chiefly, spend within their income and not make substantial losses.

What the rules dictate?
The second phase of its implementation limits losses to €30 million (Dh136m) over three seasons. Extra expenditure is permitted for investment in sustainable areas (youth academies, stadium development, etc). Money provided by owners is not viewed as income. Revenue from “related parties” to those owners is assessed by Uefa's “financial control body” to be sure it is a fair value, or in line with market prices.

What are the penalties?
There are a number of punishments, including fines, a loss of prize money or having to reduce squad size for European competition – as happened to PSG in 2014. There is even the threat of a competition ban, which could in theory lead to PSG’s suspension from the Uefa Champions League.