Iraqi officials say gunmen killed five people during a robbery of a money exchange office in the central city of Baquba on Saturday.
Authorities say the attackers shot people in the office and got away with a large amount of money.
Investigators say as security forces arrived, a car bomb exploded, wounding some police and civilians.
A security official said earlier that the robbers' actions had killed six people and wounded 10.
Iraqi authorities have blamed similar attacks on militant groups like al-Qaida seeking money to fund their activities.
There has been an upsurge of violence in Iraq in recent weeks, with bombings and the assassination of government workers and security force leaders.
On Thursday, a suicide car bomber killed more than 20 people in Hilla, a mostly Shi'ite city south of Baghdad. The attacker rammed a vehicle into a police station entrance as officers were changing shifts.
Some information for this report was provided by AP, AFP and Reuters.