The number of people injured when panic swept through a crowd of Juventus fans watching the Champions League final in a Turin piazza has reportedly risen to about 1000.

The news agency ANSA reported the figure on Sunday based on hospital tallies. Police said it was significantly higher than the 200 initially reported after the Saturday evening stampede (NZT Sunday morning).

A loud sound panicked thousands of fans gathered in Piazza San Carlo to watch the match pitting Juventus against Real Madrid on giant TV screens.

GIORGIO PEROTTINO/ REUTERS Juventus fans help a man after a stampede rocked San Carlo Square in Turin where football lovers were gathered to watch the Champions League final on the big screen.

The source of the sound was not known but ANSA said it may have been a firecracker. A stampede ensued, with fans being trampled as they tried to flee.

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GIORGIO PEROTTINO/ REUTERS Juventus fans watch the Champions League final on a big screen in San Carlo Square, Turin.

Most of the injured were treated for cuts and light contusions. Two were reportedly in serious condition.

Among the injured was a seven-year-old boy. He suffered injuries to his head and torso, and was understood to be in a serious but stable condition.

Afterwards shoes and bags littered the ground, people were seen limping and searching desperately for friends and relatives, the witness said.

GIORGIO PEROTTINO/ REUTERS San Carlo Square in Turin, Italy, was the scene of a stampede as a crowd of thousands panicked at the sound of loud bangs.

Police set up an information point to help people find their loved ones, and were investigating what caused the panic.

Real Madrid won the football match 4-1 to be crowned the European club champions.

- Reuters and AP