Cambodia's Prime Minister Hun Sen said Monday that no one to be punished for?stampede accident that occurred last week in the country.

Delivering speech at a newly-constructed building for Ministry of Social Affairs, Hun Sen said "no one is deserved to be punished for this accident," but the whole of them.

He said the main cause of the accident was the "under- estimation and the carelessness to the situation."

On the last day of a three-day water festival, 351 people died and 395 others injured by the stampede occurred at Diamond Island Bridge in Phnom Penh.

Hun Sen said the water festival will be celebrated as usual in the following years despite such accident, saying it is the national event, while at the same time, the island known as Diamond Island will be developed as planned without any change.

But, he said, his government will take strong measures and all necessary precautions to avoid a repetition of the accident.

He also said the government will use the island for one of the venues for the upcoming meeting of more than 100 political parties which is set for Dec. 1-4, 2010.

The roughly more than 100-hectares of Diamond Island is being developed into residential and commercial area, now one of the most attractive spot for happy goers in Phnom Penh both day and night.

Prime Minister Hun Sen said his government was trying utmost efforts on the day of accident to help the victims on the spot and to avoid mass chaos or panic from the public gathering in the whole city on the day.

He called this year's gathering for the water festival was a " sea of people", referring the largest ever number of people in the country's history.

With 395 injured people are still in hospitals, Hun Sen expressed his apology to the victims and the people, and urged all doctors to treat them well and if necessary for those in critical condition, to send them abroad, the government will hold responsible for the cost.

However, in his concluding speech, Hun Sen expressed his second time of tear drop following the event and questioned himself why he was so emotional with the dropping tears while he is known to have an "iron heart".