A series of bomb attacks in Iraq have killed more than 50 people - many of them soldiers.
The Karrada bomb was near a bank where soldiers were collecting pay
A roadside bomb killed at least 23 soldiers travelling on a bus between Tikrit and Baiji, north of Baghdad.
At least 14 people died in a suicide car bombing in central Baghdad, while another blast in the city left one person dead.
Attacks on police patrols in the north and north-east killed twelve, and a British soldier was killed in Basra.
Some 45 Shia Muslims were also kidnapped by gunmen while travelling by bus through the Sunni region of Ramadi in western Iraq, a provincial governor said.
On Monday, about 20 people were kidnapped from offices in Baghdad.
There is still no word on what happened to them.
'Slammed into wall'
The bus hit by the roadside bomb was not being escorted by US troops, as had earlier been reported.
"The soldiers were travelling from Baghdad to Mosul on the highway to take up their duty there," Lieutenant Colonel Rabae Al-Kidawi told the AFP news agency.
The Karrada district bomb was in a car parked outside a security cordon at the al-Rafidein bank on Rushdie Street, where security personnel collect wages on the first of every month.
Lt Col Abbas Mohammed Salman of the Iraqi police told the AP news agency eight civilians, three soldiers and three commandos were killed.
Twenty-two other people were injured.
Abdul Hassan Muhammed, a 62-year-old teacher, told AP: "A big explosion slammed me four metres (12 feet) into a wall. My friends took me to one of their stores, gave me water and asked me to relax... I didn't get my pension."
On Tuesday evening a car bomb killed three more Iraqi soldiers in the northern city of Tal Afar, the Iraqi army said.
In the north-east, one policeman and at least six civilians were killed in a bomb attack on a police patrol near the city of Muqdadiya.
The blast, which AFP said was outside a police post and bus station, also wounded at least 10 people, according to reports.
Another roadside bomb attack targeting a patrol near the northern oil city of Kirkuk killed two policemen and wounded at least one other officer.
A fourth roadside explosion killed one person and wounded another in the Zayouna district of north-eastern Baghdad.
According to AP, the explosion narrowly missed a car belonging to the minister of electricity.
In southern Iraq, a British soldier was killed in a mortar attack on a base in Basra during the early hours of the morning.
He is the first soldier to be killed in an attack on a UK military base in Iraq.