A car bomb killed nine people and wounded 32 outside a fuel station near Iraq's Interior Ministry in central Baghdad today, police and Interior Ministry sources said.
There were no further details of the incident in the Bab el-Sharji district.
Elsewhere, a reporter for a local newspaper in the northern Iraqi city of Mosul was killed along with her driver today, police said, just days after the killing of another journalist who worked for the same paper.
Police said Fadia Mohammed Ali was being driven to her office at Al Masarnewspaper when gunmen attacked her car, killing her and the driver.
More than 100 reporters and media assistants, such as drivers and translators, have been killed in Iraq, most of them Iraqis.
On Monday, gunmen in Mosul killed Mohammed al-Ban, a cameraman for the TV station al-Sharqiya who also worked for Al Masar.
Earlier, a US soldier and three Marines died from wounds suffered in combat in Iraq's western province of Anbar, the US military said today.
The military gave no further details of how they died.
At least 2,857 US servicemen and women have died in Iraq since the March 2003 US-led invasion.
Meanwhile, police found 10 bodies in the town of Latifiya, 40 km (25 miles) south of Baghdad, and they were investigating whether they were those of 10 Shia travellers kidnapped at the weekend, police said today.
Iraqi security forces have been conducting a major search for the kidnappers since the hostages were seized on Saturday.
Latifiya is in an area south of Baghdad known as the "Triangle of Death" because of a spate of attacks blamed on Sunni insurgents who frequently attack Shias on their way from the capital to the holy cities of Najaf and Kerbala to the south, as well as US forces in the area and Shia residents.