Prime Minister Hun Sen at the ceremony
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Cambodia's PM joins mourners at stampede ceremony

A day of mourning is under way in Cambodia to mark the deaths of 450 people in a stampede at the annual Water Festival in Phnom Penh.

Prime Minister Hun Sen joined officials and grieving relatives for a religious ceremony at the footbridge where the tragedy happened.

A preliminary investigation has found that the swaying of the bridge near the capital, Phnom Penh, triggered a panic.

The BBC's Guy Delauney said Cambodia's Prime Minister Hun Sen was visibly moved during the ceremony.

Go to next video: Funerals for Cambodia stampede victims