American troops and Iraqis unearthed 14 badly decomposed bodies in a mass grave northeast of Baghdad, the U.S. military said Sunday.

The site of the grisly discovery was near Muqdadiyah, an area that has seen frequent fighting between American troops and Sunni insurgents led by Al Qaeda in the volatile Diyala province.

The military said the bodies, which were found Saturday, appeared to have been in the grave for periods ranging from two to six months, and some showed signs of torture.

The bodies were unearthed not far from another mass grave discovered last week in which 37 bodies were found.

Mass graves have been turning up with increasing frequency as U.S.-led operations have cleared insurgent strongholds with an influx of troops and a Sunni revolt against Al Qaeda in Iraq that have allowed access to former no-go zones.

Muqdadiyah is about 60 miles north of Baghdad.