A day after U.S. ground forces began operating in Baghdad, coalition troops are close to controlling all roads to the Iraqi capital city,

Reuters

reported Sunday, citing a U.S. commander.

The report stated that only one main road, in the northern part of the city, hadn't yet been secured. "We're just about there," Col. Will Grimsley, commander of the 1st Brigade of the U.S. 3rd Infantry Division, told a

Reuters

correspondent who asked if the coalition controlled all access to Baghdad.

"Look at it from this point of view -- 1st Brigade holds the airport and the west of Baghdad, the 2nd Brigade is securing the south, the 3rd Brigade is holding the northwest and the Marines are in the northeast,"

Reuters

quoted Grimsley as saying.

CNN's

Web site, citing Army sources, reported that troops from the U.S. Army's 3rd Infantry Division were near the center of the Iraqi capital early Sunday on a reconnaissance mission. That report also indicated that U.S. forced have encircled Baghdad.

More than 2,000 Iraqi troops have been killed since the Baghdad incursions started Saturday,

CNN's

Web site reported, quoting U.S. Central Command spokesman Capt. Frank Thorp. The report also said that U.S. soldiers say they're seeing an increasing number of Iraqi army units and military vehicles leaving Baghdad. An

Associated Press

report stated that as many as 3,000 Iraqi fighters might have been killed in the Baghdad raids.

Reuters

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also quoted U.S. military officials who said on Sunday that no weapons of mass destruction have been found in Iraq.

"The places it's most likely to be found we haven't even gotten to them yet,"

Reuters

said Brig. Gen. Vincent Brooks told a briefing at Central Command. "The closer we get ... there are fewer and fewer options on what can be used to deliver weapons of mass destruction. As we continue to advance more areas are taken away. We are pleased that it hasn't been used to date but not satisfied that the threat has gone."

Meanwhile, British forces were taking up strategic positions to secure the southern city of Basra Sunday, a

CNN

report indicated.

In northern Iraq, a U.S. aircraft mistakenly dropped a bomb on a convoy believed to be carrying Kurds and possibly U.S. military personnel,

CNN

and the

Associated Press

reported. At least 12 people were killed, according to the reports.

Separately, a convoy carrying Russian diplomats, including Russia's ambassador to Iraq, was reportedly attacked Sunday as it headed for the Syrian border, U.S. and Russian officials said.

CNN

said that according to the U.S. Central Command, the attack occured in territory controlled by the Iraqi government. U.S. officials also said no coalition forces were in the area at the time,

CNN

reported.