Amy Winehouse reportedly punched a fan while performing at British music festival Glastonbury.
News agency Associated Press reported the troubled soul singer climbed down from the stage, jumped into the crowd and scuffled with a fan.
It is not clear what sparked the incident.
Winehouse sang for about an hour at Glastonbury, following her comeback show at Nelson Mandela's 90th birthday celebrations.
She has been hospitalised for the past week for what her father said was emphysema bought on by drug use.
This has been denied by Winehouse's reps.
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