[Updated at 4:25 p.m.] Steve Finch, a Phnom Penh Post reporter, told CNN that the stampede at the water festival in Phnom Penh began around 10 p.m. Monday (10 a.m. ET), when police began firing a water cannon onto a bridge to an island in the center of a river.
The bridge was packed with people, and police fired the water cannon in an effort to get them to move, he said.
"That just caused complete and utter panic," he told CNN in a telephone interview. He said a number of people lost consciousness and fell into the water; some may have died by electric shock, he said.
Watch: "It was chaos," reporter says
Finch cited witnesses as saying that the bridge was festooned with electric lights, which may have played a role in the deaths.
The government denied anyone died by electric shock.
But a doctor who declined to be identified publicly said the main cause of death was suffocation and electric shock. Police were among the dead, he said.
While Finch said the incident apparently coincided with the firing of the water cannon, a witness, Ouk Sokhhoeun, 21, told the Phnom Penh Post that the stampede began first.
In addition to the 339 people who have been confirmed dead, 329 people were injured, Prime Minister Hun Sen said, according to The Phnom Penh Post.
The incident happened on the final day of the three-day festival, according to The Phnom Peng Post. The festival, which attracts people from all over Cambodia, is held annually to commemorate a victory by the Cambodian naval forces during the 12th century reign of King Jayavarman VII, according to the Tourism Cambodia website.
[Updated at 3:37 p.m.] Steve Finch, a Phnom Penh Post reporter, told CNN there were reports from witnesses of people electrocuted as police fired water cannons at people on the bridge to hurry them along causing the stampede.
According to a Radio Australia report, a big crowd watching the annual water festival panicked when a number of people were apparently electrocuted on the bridge.
Cambodian authorities say hundreds of people were either crushed in the resulting stampede or drowned when they fell or jumped into the river.
Prime Minister Hun Sen has given several post-midnight live broadcasts to update the country. In one, according to the Associated Press, he called the stampede the "biggest tragedy" in Cambodia since the Khmer Rouge reign of terror in the 1970s.
He also ordered all government ministries to fly the flag at half-staff and said there would be a national day of morning.
[Updated at 3:05 p.m.] Cambodian Prime Minister Hun Sen said on state-run TV he was unsure yet as to what caused the stampede.
"This needs to be investigated more," Hun Sen said, according to an AFP report.
Hun Sen said a committee would be set up to examine the incident.
The Associated Press, Reuters and AFP reported that witnesses said 10 people had either collapsed or become unconscious during the festival, triggering the panic.
That led, they reported, to people rushing towards a bridge headed toward Diamond Island. That's when things got worse, a witness told AFP.
"We were crossing the bridge to Diamond Island when people started pushing from the other side. There was lots of screaming and panic," 23-year-old Kruon Hay told AFP. "People started running and were falling over each other. I fell too. I only survived because other people pulled me up. Many people jumped in the water."
Sok Sambath, governor of the capital's Daun Penh district, told AFP "this is the biggest tragedy we have ever seen."
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[Updated at 2:41 p.m.] Khieu Kanharith, the Cambodian Minister of Information, has said the death toll from the stampede has now reached 339.
The three-day festival attracts people from all over Cambodia - and around the world - to the Royal palace. The festival is held annually to commemorate a victory by the Cambodian naval forces during the 12th century reign of King Jayvarman VII, according to the Tourism Cambodia website.
The festival is also used to pray for a good rice harvest, sufficient rain and to celebrate the full moon, the site says. The festival dates back to before the 7th century.
At night, the boats on the river are illuminated with neon lights and there is a fireworks display.
[Updated at 2:36 p.m.] Cambodian Prime Minister Hun Sen said Monday on state-run Bayon Television that more than 200 people have died in the water festival stampede.
Officers with the Prime Ministers Bodyguard Unit stood outside a local hospital trying to help those who brought injured and control the scene of chaos outside.
Hundreds of shoes, clothing and personal items still littered the streets, the bridge and the underlying water near where the festival took place. The road on the bridge was so covered you could barely see the surface.
[Updated at 2:26 p.m.] Ambulances appeared to be making runs back and forth between the scene of the stampede and the hospital - dropping off the injured and then speeding away again, video on state-run Bayon Television showed.
Doctors stood outside a hospital, trying to direct traffic, between ambulances and vehicles of regular citizens bringing in the injured.
Friends and family clutched some the injured already in the hospital while others raced from the streets clutching the injured in the arms.
[Updated at 2:23 p.m.] Video from state-run Bayon Television in Cambodia showed panic in the streets and outside local hospitals.
Dozens of injured people appeared to be laying on what appeared to be the waiting room floor of a hospital with IV lines hooked up to them that were strung across benches.
[Updated at 2:04 p.m.] Cambodian Prime Minister Hun Sen said Monday on state-run Bayon Television that 180 people have died in the water festival stampede.
"With this miserable event, I would like to share my condolences with my compatriots and the family members of the victims," he said, according to AFP.
More than 4 million people were attending the Water Festival when the stampede occurred, said Visalsok Nou, a Cambodian Embassy official in Washington.
[Posted at 1:55 p.m.] More than 100 people were killed Monday in a stampede that occurred during a festival near Cambodia's royal palace in Phnom Penh, a Cambodian Embassy official in Washington said.
This story is developing. We'll bring you the latest information as soon as we get it.
The event was so bad, people were dying to get out...
Easier said than done. It becomes harder and harder to breathe and you are being crushed against each other....
m very said ...........i want cry .
Like that teabagger stomping the head of someone that opposed the tea bag candidate.
Unsure if any of you have ever been caught in a crowd. In the 1980's Attended a soccer match in Glasgow,Scotland and there were only 4 ticket enterances open. There were tens of thousands of people all trying to get through 4 narrow enterances. It is a helpless feeling of not being able to move and being crushed against one another. It was getting hard to breathe. It is a scary situation. I am 6'5" tall and around 225 lbs but felt helpless but many of the younger kids fared much worse. Many people were doing their best to make sure the younger kids got out of the crowd and trying to protect them from being crushed. It is a very scary feeling. I feel for the people caught in this mehhem in Cambodia....
Some people who are postiing their racist comments right here on CNN.com regarding the stampede don't deserve to be born on this planet in the first place. It is a very sad accident and it happened all over the world in Germany over a concert and America over Black Friday Shopping. Those nasty comments show how low and shallow some people in Amerca has become . They know nothng else than complaining with a full stomach, Voila
Just because they are typing in English and on CNN.com, doesn't mean they are American. That's your own prejudice at play.
What's with all the American bashing (U.S. specifically)?
You other countries (and US bashing liberal Democrats and their pravda mainstream media cohorts)
can clean up the 500 million people that will starve if we quit exporting food (over 100 contries will be affected with starvation should this happen). You should praise our country not demean it. Those that knock this country ignore the good that we do in the world. It isn't easy being the world's policeman but would prefer China do that? someone will fill the void and likely some country with much poorer regard for human life than this exceptional country.
I love this country enough to admit that we aren't perfect. I love this country enough to know that we could be better. I love this country enough to work to make things better. Blind patriotism is a disease that corrupts a country from within. A patriot with open eyes works to make their country greater by not resting on their laurels but constantly striving towards greater achievements.
I don't like the use of the word "stampede", it makes people sound like buffalo.
http://www.bayontv.com.kh/bayon-tv.php it is live from the scene now.
30 yrs ago hubby & I along with 2 small kids were trapped on small bridge @ amusement park! the kids wouldve been crushed when the crowd pressed had we not put them on our shoulders above the crowd. I could hardly breathe. We made it out ok but others were injured! Lesson learned: steer away from gathering crowds! Those people do this yr aftr yr & WILL return next year! Im Proud to be American.. with a little common sense.
Was this a park in Cambodia?
My gf of 8 years is Cambodian and at first this was funny, but then I thought it was horrible. Take the time to actually realize that asians are people too. Cmon guys.
the fact that you have to say this makes me wonder what century it is.
Did you really think this was funny?
No he's right. Its hilarious.
*disappointed in you*
If only they had the TSA there. They would have protected them all. There primary concern is the security of people, after all.
"national day of morning"
Is this home grown American stupidity or another example of your crack staff in India doing the needful?
Thats terrible. You think they have enough problems there.