Effect of Terrorism

No bomb was needed, just someone stating there could be a suicide bomber.

Brig. Gen. Khalid Hassan said that many of the people had died in the crush or were drowned after falling off the al-Aima Bridge.

Hassan, who commands the police in the capital's Azamiyah district, said the accident occurred due to the immense crowd that tried to cross the bridge.

Police confirmed that that someone in the crowd said there may be a suicide bomber among the crowd, sparking a panic.

Kind of like yelling fire in a crowded theater. The Shiites are obviously effected by the terrorism and something like this proves the effectiveness of the tactic on locals. For all that is known, this could have been sparked by a terrorist, but the complete facts will never be truly known.