Iraqis met under American auspices to shape a new government yesterday and said "the rule of law must be paramount" following Saddam Hussein's fall. In a war dividend, U.S. officials said they had taken Palestinian terrorist Abul Abbas into custody in Baghdad.

Four weeks after U.S.-led forces unleashed their assault, President Bush promised to "liberate every corner" of Iraq and American troops hastened to redeem his pledge. Marines solidified their grip on Tikrit, Saddam's hometown, and American officials said fighting had ended in Qaim, a town near the Syrian border.

Acting on a tip, commandos searching a home in Baghdad found a weapons cache with a sizable chemical laboratory and documents they said were instructions on making chemical and biological weapons. They also reported finding a bomb concealed inside a bottle, another in an umbrella and a third in a telephone.

The U.S.-organized meeting on a new government drew scores of Iraqis to a gold-colored tent erected in Ur - birthplace of the biblical patriarch Abraham - and anti-American protest in a nearby city.

"No to America and no to Saddam," chanted thousands of Shiite protesters in Nasiriyah, exercising their new freedom of speech to object to the imminent creation of an American interim governing authority.

Inside the meeting, White House envoy Zalmay Khalilzad said the United States has "no interest, absolutely no interest, in ruling Iraq."

He added, "We want you to establish your own democratic system based on Iraqi traditions and values."

A 13-point statement released after the session envisioned a democratic country where "the rule of law is paramount." It said Saddam's "Baath party must be dissolved and its effects on society must be eliminated."

It wasn't immediately clear whether the paper was drafted by U.S. officials in advance of the meeting.

Abbas, the leader of a Palestinian group that killed an American on the hijacked cruise liner Achille Lauro in 1985, was captured by U.S. commandos on Monday, U.S. officials disclosed.

A number of his associates also were detained during raids at several sites around Baghdad, these officials said on condition of anonymity.

Abbas, whose name actually is Mohammed Abbas, led a faction of the Palestine Liberation Front, a Palestinian splinter group. His faction was in Tunisia until the attack on the Achille Lauro, after which it relocated to Iraq. Leon Klinghoffer, an elderly American, was shot and tossed overboard in his wheelchair during the hijacking.

There was no major combat during the day, but at least 10 Iraqis were reported killed and 16 injured in a clash between U.S. Marines and a stone-throwing crowd in Mosul in northern Iraq, The New York Times reported. Lt. Cmdr. Charles Owens, a spokesman at U.S. Central Command in the Persian Gulf, denied reports that U.S. troops shot into the crowd but said he didn't have other details about the incident.

Central Command reported an unidentified Marine was shot to death in Baghdad by a member of his unit who mistook him for an Iraqi soldier. Another Marine, Cpl. Ariel Gonzalez, 25, of Hileah, Fla., was killed Monday when a commercial refueling vehicle collapsed on him in southern Iraq, the Pentagon said. Late yesterday night, the Pentagon announced a third accidental death: Army Spc. Richard A. Goward, 32, of Midland, Mich., was killed Monday in a truck crash.

While anti-American sentiment flared in Iraq, U.S. forces also won cooperation from civilians eager to restore order and vital services.

Some Marines in Tikrit wore flowers in their uniforms, gifts from residents of the city.

Joint Iraqi-U.S. patrols made their first forays into Baghdad. American commanders reported ample assistance from Iraqis eager to help troops uncover regime secrets.

"We're getting millions of these tips, some credible, some not so credible," said Lt. Col. Philip DeCamp. The United States was offering incentives, too. Defense officials said the Pentagon would pay up to $200,000 for information on the whereabouts of regime leaders.

Soldiers patrolling northern Baghdad found a mobile AM radio station in a warehouse at the Iraqi railroad yard, and worked to clear a city park from hundreds of munitions left from an Iraqi artillery and mortar position.

In Washington, the Bush administration dampened talk of possible military action against Syria. Secretary of State Colin Powell, who suggested diplomatic or economic measures might be taken, said Iraq was "a unique case" that required U.S. military action.

Administration officials have accused Syria of maintaining a program to develop weapons of mass destruction and of harboring members of the Iraqi regime seeking to flee. Syrian officials deny the allegations.