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A picture taken on July 24, 2014, shows the remains of a bus that was transferring convicts from a prison north of Baghdad after it was attacked by suicide bombers and gunmen, in Taji, some 25 kilometres (15 miles) north of Baghdad. Security and medical officials said that around 50 prisoners were among the dead, many of them burnt beyond recognition. A number of policemen also died. AFP PHOTO/AHMAD AL-RUBAYEAHMAD AL-RUBAYE/AFP/Getty Images
A picture taken on July 24, 2014, shows the remains of a bus that was transferring convicts from a prison north of Baghdad after it was attacked by suicide bombers and gunmen, in Taji, some 25 kilometres (15 miles) north of Baghdad. Security and medical officials said that around 50 prisoners were among the dead, many of them burnt beyond recognition. A number of policemen also died. AFP PHOTO/AHMAD AL-RUBAYEAHMAD AL-RUBAYE/AFP/Getty Images

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Dozens killed in Iraq suicide attack

CNN's Michael Holmes reports on another deadly suicide attack and a potential political breakthrough in Iraq.

Dozens killed in Iraq suicide attack

CNN's Michael Holmes reports on another deadly suicide attack and a potential political breakthrough in Iraq.