Two car bombs have exploded in the Iraqi capital, Baghdad, killing at least six people and injuring 47 more, emergency services told the BBC.
The powerful blast caused widespread damage
The dead were thought to be civilians, killed by the first blast. Six policemen were injured in the second blast at an Iraqi river police station.
Shops and cars were damaged by the first bomb, aimed at a US military convoy that was not hit.
More than 300 people are believed to have died in violence this month.
There has been intense violence since a new Iraqi government was announced in late April.
The first car bombing hit Saadoun Street, a busy part of Baghdad's business district.
The attack happened within a stone's throw of the spot where a similar explosion took place on Saturday, killing 17 people.
Nearly 50 people were injured in two suicide car bombings
Police securing the area fired warning shots in the air to drive back the crowd of onlookers, as firefighters tried to put out at least seven burning vehicles, the AFP news agency reports.
Hours later another suicide bomber rammed his vehicle into the gates of a river police station in the Abu Nawwas area to the south of central Baghdad.
Several policemen were among those injured in the blast, nobody is reported to have been killed.
A US marine was killed in a bombing in Iraq, the military said on Tuesday.
The marine died on Monday of wounds inflicted during combat operations in Nasser Wa Salaam near Falluja.
As of Monday, 1,224 members of the US military have died as a result of hostile action, according to the US defence department.
The US military says its forces have killed up to 100 insurgents in a major operation that is continuing close to the Syrian border.
Correspondents say American forces are trying to root out insurgents sheltering in villages north of the Euphrates River, who are thought to have set up supply routes to bring in weapons and explosives from Syria.
They say many residents are now fleeing the area.
There has been no confirmation of any US casualties.