New pictures and claims of abuse by U.S. forces in Iraq have surfaced as the first American soldier to face a court martial was named.

A new photo has surfaced showing two German shepherd dogs about to brutalize a naked prisoner in Abu Ghraib prison.

The photo was obtained by Seymour Hersh of the New Yorker, who says other photos that will be published are even worse. "We have a photo of the dogs right at him. And a moment later, he is on the ground and there's a large gaping wound and a big pool of blood," said Hersh.

Wired Iraqi prisoner at the Abu Ghraib prison, Iraq. (AP Photo/Courtesy of The New Yorker)

U.S. senators say the Pentagon will soon give them access to all the photos and videotapes it has, some of them said to be horrifying.

"The American people need to realize we are talking about rape and murder charges here. We are not just talking about people giving a humiliating experience," said Senator Lindsey Graham.

At a news conference in Baghdad on Sunday, women held pictures of their sons and husbands. They say they are searching for information on their fate.

And men, one after the other, walked to the microphone to describe their torture.

A group called the Iraq Occupation Watch says it has collected 50 new cases of abuse at eight separate U.S.-run prisons in Iraq. But Canadian human rights worker Stewart Vriesinga says proving the allegations may be difficult.

"Verification is virtually impossible. But we've spoken to a very large number of released detainees," he said. Vriesinga, with the Christian Peacemaker Team, says problems at the prisons in Iraq are widespread.

The U.S. is also seemingly acknowledging that there will be more allegations to deal with in the days ahead.

"We are aware that many of the victims, are in fact, have been in fact released from Abu Ghraib. We have seen some on television documenting and telling their story. We will stay in contact with them. I know there are some decisions being made at the highest levels about what we should be doing for these victims. I suspect when those decisions are made we will announce them from this podium," said U.S. military spokesperson Brig.-Gen. Mark Kimmitt.

The U.S. announced Sunday it will start dealing with those who have already been accused of mistreating detainees. Army Specialist Jeremy Sivits is one of six soldiers now facing a court martial over allegations of abuse at Abu Ghraib prison. His will begin in less than two weeks, on May 19, in Baghdad.

Sivits faces charges of conspiracy to mistreat detainees, dereliction of duty for failing to protect prisoners and maltreatment of detainees.

Sivits could face one year in prison, reduction in rank to private, forfeiture of two-thirds of his pay for a year, a fine or a bad conduct discharge.

Seven officers have also received career-ending reprimands.

But the charges of abuse have not meant an end to the attacks on the coalition.

Late Sunday night, a bomb exploded outside the Four Seasons hotel in the capital. Six people, two Britons, two Nepalese and two Iraqi guards were wounded. The extent of their injuries is not known.

Earlier an explosion ripped through a market in Baghdad as a military convoy passed, killing seven Iraqis and wounding 17.

Fresh fighting broke out between militia loyal to the radical cleric Muqtada al-Sadr and U.S. forces in northeastern Baghdad.

In southern Iraq, battles continued for a second day as al-Sadr's militia fired mortar shells at the governor's office in Amarah. British forces responded with helicopter strikes, destroying nearby homes.

Three coalition soldiers died following a roadside bomb explosion in Basra, but running streets battles have subsided after a day of bloodshed.

At the heart of the standoff, in the holy city of Najaf, U.S. tanks opened fire after a mortar attack by Mahdi army militants. Al-Sadr remains holed up near a Shia shrine in the city, defying coalition attempts to capture or kill him.

Military commanders have tightened their grip on Najaf, but fear an all-out attack would inflame the country.