BAGHDAD, July 16 — A suicide bomber in the volatile northern city of Kirkuk on Monday crashed his truck into a compound that includes offices of a major Kurdish political party, killing 85 people. Many victims were women and children, shopping in the busy market next to the political offices, who were engulfed by a large fireball.

Hours later, the Iraqi authorities said, men wearing Iraqi military uniforms stormed into a village in Diyala Province and killed 29 men, women and children. An Iraqi security official, Col. Ragheb Radhi al-Umiri, said the gunmen surrounded the victims and fired into the crowd. The attack occurred in a remote village north of Baquba, he said, and the bodies of some victims were “desecrated” before the attackers fled.

In response to questions, an American military spokesman in Baghdad said via e-mail that American forces had received a report from the Diyala Provincial Joint Coordination Center that men “wearing Iraqi army uniforms attacked Adwala village, killing 29 civilians and wounding four civilians,” and that the attackers rode in new Iraqi police trucks. The coordination center serves as a clearinghouse for emergency response services in the province.

No other information was available about the attack. If the Iraqi authorities’ accounts are correct, they suggest that the attackers either were able to steal official Iraqi uniforms and vehicles or that they may have themselves been members of the security forces.