Iraqi officials say insurgents carried out two separate suicide car bombings in central Baghdad early Tuesday.
The officials say at least seven people were killed and 16 wounded in the first bombing, which occurred as a U.S. military convoy passed by.
It was not immediately clear if any U.S. vehicle was hit.
Shortly afterwards, another suicide attacker struck a different section of the city. There were no immediate reports of casualties from the second attack.
Meanwhile, the U.S. military is continuing a major offensive against insurgents in western al-Anbar province.
Military officials said Monday at least 100 insurgents have been killed since the operation near the Syrian border began Saturday.
In another development, Japan's Foreign Minister says a Japanese employee of a security firm is reported to have been kidnapped in Iraq.
An Islamic militant group (the Ansar al-Sunnah Army) says the man (identified as Akihito Saito) was captured when the group attacked a convoy in western Iraq.
Some information for this report provided by AFP and Reuters.