Ayatollah Ali Khamenei

Iran's Leader Ayatollah Ali Khamenei is partly blaming allied forces in Iraq for the deaths of over 1000 Iraqi's during yesterdays chaos in Baghdad.

He said

'It is certain that Iraq’s occupiers, who have imposed their evil presence in Iraq under the pretext of bringing security, are responsible for such devastating accidents and they must be held accountable.
I urge Iraqis to maintain their unity and disappoint the enemy, which aims to create disunity by such plots.'

Iraqi Defence Minister Saadoun al-Dulaimi had revealed yesterday that there was some truth behind the rumours of suicide bombers when 3 had blew themselves up before reaching the shrine when they were stopped at a checkpoint.

This was not an attack on allied forces, this was purely an act of revenge on Shi'ite muslims by Sunni extremists.
This was not an accident.