Insurgents have penetrated Baghdad's heavily fortified Green Zone to carry out two bomb attacks, at least one believed to be a suicide bombing. Four Americans and six Iraqis are now known to have died, US officials said. The Green Zone, where Iraqi government offices and US forces are based, comes under frequent mortar fire. But these attacks - in what is supposed to be the safest place in Iraq - are the first major breach of security inside the zone, correspondents say. In a statement posted on an Islamic website, the group led by Jordanian militant Abu Musab al-Zarqawi said it was behind the blasts, which it described as one of their "most successful operations." [
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