Scores of people have been killed in a series of blasts in the mainly Shia Sadr City area of the Iraqi capital, Baghdad.
Three car bombs exploded and there was also at least one mortar attack, reports said. One of the blasts targeted a food market which has been attacked several times.
Officials said that 115 people had been killed but other reports put the toll at more than 140. A further 200 people are reported to have been injured.
Witnesses spoke of bodies strewn among mangled wreckage and body parts in the streets, while surrounding buildings were left ablaze.
The blasts destroyed whole streets and caused immediate panic, leaving emergency services struggling to cope.
People injured in the blasts were rushed to hospitals, where doctors worked to treat them.
Earlier in the day, US troops opened fire on a minibus in Sadr City, killing four passengers.
The shootings happened as US troops carried out a raid in the city, Iraqi security sources said.