Iraqi authorities are investigating a fire that destroyed sensitive documents during an apparent Al Qaeda in Iraq attack against the Central Bank of Iraq, amid suspicions that the fire may have been set to destroy evidence in a potentially huge corruption case, officials say. Investigators became suspicious ... after they discovered that the fire was not caused by [the attack] but rather appeared to have been started deliberately in a second-floor room that is used by the inspector general responsible for investigating corruption cases, said Sabah Saadi, who heads the Integrity Committee in Iraq's parliament, charged with monitoring corruption. According to Saadi, the fire destroyed documents stored in the room that pertained to a particularly sensitive case involving a series of fraudulent checks drawn against accounts held by different companies with state-owned banks. At least $711 million had been found to be missing in the scheme, and two bank managers had been detained as part of an investigation before the fire, he said. But Saadi suspects that the scam may have been much larger and could have involved many more people. The investigation into the fire raises tantalizing questions about the nature of the attack, the role of Al Qaeda in Iraq and the extent of corruption in the country.