Three suicide bombers have attacked Baghdad's Green Zone government compound, killing two bystanders. Police shot and captured one of the bombers before he could set off his explosives. Police say the attack, which has been claimed by Al Qaeda's Iraq wing, involved a car bomber followed up by two bombers on foot. The target was a checkpoint guarded by Iraqi troops and police and used by civilians arriving for work at the fortified complex. Doctors at the city's Yarmouk hospital say they have seen two bodies from the attack and five people are wounded.One of those is thought to be the third bomber, who failed in his mission and whose capture could yield important intelligence. It is rare for forces in Iraq to capture people they know are involved in suicide bombing. They will be anxious to gather what intelligence they can, though it is equally likely the bomber knows little of the men who sent him on his mission. The suicide explosions have been followed by a mortar attack on the Green Zone, which formerly housed Saddam's main presidential palaces.