Amy Winehouse's set was deemed a "triumph" by Michael Eavis
Police say they have received no complaints of assault after singer Amy Winehouse appeared to punch a fan during her performance at Glastonbury.
A spokesman at the festival said there would subsequently be no investigation. Founder Michael Eavis defended the star, saying she had appeared to lash out after being touched by a fan.
He added that Winehouse had asked if she could headline next year's music event, and he described her show on Saturday as a "triumph".
Veteran singer Neil Diamond was one of the main performers at the festival on Sunday, singing a number of classic hits including Sweet Caroline.
Leonard Cohen, The Verve, Mark Ronson and Stackridge - the band that played the first Glastonbury set in 1970 - also took to the stage on the event's closing day.
Winehouse was followed by US rapper Jay-Z, who gave a triumphant performance to win over critics who claimed a hip-hop act should not headline the festival.
Winehouse's one-hour performance was her first full UK show for seven months.
It drew a huge crowd to the Pyramid Stage but split opinion among fans. †Her spokesman said at least 75,000 people watched and that organisers had never seen the field so full.
Mark Ronson performed on The Other Stage
"The 'lashing out' was when someone tried to grab her hair and she reacted," the spokesman said.
He added that "one person misbehaving" did not spoil the singer's enjoyment of her performance.
But footage of the incident did not clearly show what provoked her lunge.
The Grammy-winning singer was on fine form and in good voice for most of the set, going some way to dispelling fears about her health.
She jumped down into the security pit for the last two songs, separated from the fans by a crush barrier.
"Thanks for your support," she told them earlier, as she performed tracks such as Cupid, Rehab and Tears Dry on Their Own.
"I really enjoyed it - I've never seen her live before and I thought it was really good," said one fan, 18-year-old Lucinda Whitehead.
But Laura Bradley, 24, said: "It's a shame the crowd didn't appreciate her. They were slagging her off."
There appeared to be a smaller crowd for Jay-Z, but he was greeted by chants and cheers.
The New York hip-hop star fired up the crowd with an introduction that included a BBC interview in which Oasis star Noel Gallagher said hip-hop was "wrong" for Glastonbury.
Jay-Z then took the stage to the strains of the Oasis hit Wonderwall.
"So they say you guys didn't want me here to be here tonight," he said.
"They said you guys weren't into hip-hop." The crowd responded by chanting his name to show their support.
"Thanks for all the love here tonight," the star added, saying Glastonbury had "embraced my culture".
"This is a beautiful moment, I'm glad to share it with each and every one of you," he said.
Some 170,000 people were on site on Sunday morning, police said.
Crime has almost doubled compared with the same stage of the festival last year, with 451 reported offences, up from 236 in 2007. Much of that increase is down to a rise in thefts from tents.