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At least 339 people have been killed in a stampede during a festival in the Cambodian capital Phnom Penh.

The crush happened on a bridge, as huge crowds gathered on a small island for the final day of the Water Festival.

Some victims are reported to have drowned after jumping into the water to escape the scrum.

An Australian eyewitness, Sean Ngu, was 30 metres away from the bridge, and described the change in the mood of the crowd.