The U.S. military in Iraq says seven people have been killed and 20 others wounded in a suicide bombing at a government facility in Baquba.
A U.S. statement says the dead include a U.S. soldier, a U.S. contractor and five Iraqi government workers. At least 20 others, including nine U.S. personnel, were wounded.
Meanwhile, Sunni, Shi'ite and Kurdish negotiators are scrambling Tuesday to reach an accord on a new Iraqi constitution, ahead of a parliament vote on the charter set for Thursday.
Officials say issues of federalism and the division of authority between the presidency and parliament remain unresolved.
Majority Shi'ites and the Kurds are seeking a decentralized government that allows significant regional autonomy in the Kurdish north and Shi'ite southern Iraq.
Sunnis want a centralized government seen as protecting their minority interests in central Iraq.
Some information for this report provided by Reuters.