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An Iraqi man inspects a destroyed prisoner transport bus in the town of Taji, about 12 miles (20 kilometers) north of Baghdad, Iraq, Thursday, July 24, 2014. Gunmen attacked a prisoner convoy north of Baghdad on Thursday, setting off a gunbattle with troops in which scores of prisoners and several soldiers were killed, brutally underscoring Iraq’s instability as lawmakers convened to elect a new president. Image Credit: AP

Baghdad: Suicide bombers and gunmen on Thursday attacked a bus transferring convicts from a prison north of Baghdad, sparking fierce clashes with security forces that left at least 60 dead, police said.

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.

“At least 60 people, prisoners and policemen, were killed in a suicide attack followed by several IEDs [improvised explosive devices] and shooting,” an interior ministry official said.

It was not immediately clear who launched the assault, which targeted a security convoy escorting a bus that was transferring around 60 prisoners, many of them held on terrorism charges, from the main prison in Taji, some 25km north of Baghdad.

The attack took place at about 400am (0100 GMT), hours before UN Secretary General Ban Ki-moon was to hold talks with Prime Minister Nouri Al Maliki in an effort to spur international mobilisation against a jihadist insurgency.

It came a year almost to the day after militants attacked the same prison in Taji and another facility in Abu Ghraib, west of the capital, killing at least 20 members of the security forces.

Officials said at the time that no inmates had escaped from Taji prison but 500 broke out of Abu Ghraib.