The swarming crowds had been heading to a religious ceremony at the Kadhimiya mosque in the old district of north Baghdad when someone shouted there was a suicide bomber among them, a police source said.

Most victims were women and children who "died by drowning or being trampled" after panic swept a throng of thousands as they headed to a religious ceremony, an Interior Ministry official said.

"An hour ago the death toll was 695, but we expect it to hit 1,000," said Dr Jaseb Latif Ali, a general manager at Iraq's Health Ministry.

Interior Minister Bayan Jabor and two top Shia officials blamed insurgents for the stampede, saying a terrorist spread a rumour there was a suicide bomber in the crowd.

Tensions are high among Iraq's rival religious and ethnic communities ahead of a referendum on a new constitution for the post-Saddam Hussein era.

Television images showed people clambering down from the bridge to escape the surging crowd, and piles of slippers left behind by the crush of people.

Hysterical women knelt over corpses, wailing and praying. Ambulances rushed to the scene and people carried bodies on stretchers while others lined the river banks and crowded the bridge.

Scores of bodies were covered with whatever was around -- foil, clothes or plastic sheeting.

One hospital said it had received at least 100 bodies by 12:30 (0830 GMT). A hospital source said bodies were also being sent to two nearby hospitals.

SUICIDE BOMBER
A police source said swarming crowds had been heading to the Kadhimiya mosque in the old district of north Baghdad when someone shouted there was a suicide bomber among them.

"Hundreds of people started running and some threw themselves off the bridge into the river," the source said.

"Many elderly died immediately as a result of the stampede but dozens drowned, many bodies are still in the river and boats are working on picking them up."

Earlier at least seven people were killed in three separate mortar attacks on the crowd heading to the mosque to celebrate the martyrdom of Musa Al-Kadhim, a revered religious figure among Shias.

Reuters Television showed a woman weeping over the body of her dead child in al-Nu'man hospital. Dozens of bodies were strewn across the floor.

The hospital was filled with the sounds of screaming and wailing as disconsolate men and women searched for, and found, loved ones.

Doctors and orderlies were treating many of the injured on the floor or on trolleys in corridors. A child lay unconscious on a stretcher, with an intravenous drip dangling from her arm.

Prime Minister Ibrahim Jaafari declared three days of mourning and President Jalal Talabani said in a statement that it was "a great tragedy which will leave a scar on our souls".

Explosions were heard across Baghdad on Wednesday morning.

A Reuters correspondent reported hearing six mortar rounds exploding near the main airport, although the U.S. military had no information of any attacks there.

INSURGENCY UNABATED
Despite the draft constitution, there has been no easing in an insurgency waged by Sunni Muslims, dominant under Saddam, and international guerrillas inspired by Osama bin Laden.

The US-led coalition invaded Iraq in March 2003 and has been battling insurgents while Iraqis have tried to form a new post-Saddam constitution and government.

The persistent fighting has helped to push down President George W. Bush's approval rating to a career low of 45 percent on concerns over the war and soaring fuel prices, according to an ABC News/Washington Post poll published on Tuesday.

The US war in Iraq now costs more per month than the average monthly cost of military operations in Vietnam in the 1960s and 1970s, according to a report issued on Wednesday.

The report, entitled "The Iraq Quagmire" from the Institute for Policy Studies and Foreign Policy in Focus, both liberal, anti-war organisations, put the cost of operations in Iraq at $5.6 billion per month.

This breaks down to almost $186 million a day.

"By comparison, the average cost of U.S. operations in Vietnam over the eight-year war was $5.1 billion per month, adjusting for inflation," it said.

DHAKA SHOCKED
Bangladesh yesterday expressed its deep shock at the tragic death of a large number of people in a stampede on a Baghdad bridge over the Tigris River near Kadhimiya Mosque in Iraq, says UNB.

A spokesman for the Ministry of Foreign Affairs said, "We convey our deepest condolences and sympathies to the members of the bereaved families and pray for salvation of the departed souls."

The spokesman also said Bangladeshis pray for the early recovery of the persons injured in the incident, expressing the hope that the people of Iraq will be able to overcome their shock and grief soon and carry on with their life and business.