U.S. military officials in Iraq say fighting in the northern city of Mosul has calmed after an intense operation Tuesday to regain police stations and government buildings taken by insurgents last week.

Officials Wednesday said that some pockets of resistance remain as coalition forces work to secure Iraq's third-largest city.

Earlier today, U.S. and Iraqi forces pounded insurgent positions in Fallujah, in an effort to oust the remaining fighters more than a week after the launch of an offensive there.

Scattered attacks and car bombings have been reported today in other parts of Iraq, causing an unknown number of casualties.

Meanwhile, family members of CARE International aid worker Margaret Hassan say it appears she has been killed by kidnappers who abducted her last month in Iraq.