BAGHDAD  American military units fired on insurgents while supporting Iraqi troops northeast of the capital on Sunday, Iraqi officials said. It was the second such episode since the United States declared an end to its combat operations in Iraq less than two weeks ago.

There were no American casualties in the fighting in Hudaidy, a village about 50 miles from Baghdad that has long harbored members of the Sunni insurgent group Al Qaeda in Mesopotamia.

Iraqi security officials said three people were killed: an Iraqi soldier, an Iraqi police officer and an insurgent. Ten people were wounded.

The United States military did not confirm its role in the fighting. An American military spokeswoman said Sunday in an e-mail that she was awaiting “releasable information.”