INSURGENTS INFILTRATE BAGHDAD'S GREEN ZONE BAGHDAD — After years of efforts, Sunni insurgents have succeeded in penetrating Baghdad's fortified Green Zone. Officials said Sunni insurgents, aided by Iraqi employees, entered the Green Zone and blew up the cafeteria in parliament. Three out of the eight people killed in the suicide bombing on Thursday were parliamentarians. "Regardless of the numbers of those who have been unfortunately killed or injured, this does reflect the gravity of the problems that Iraq is facing," former Iraqi Prime Minister Iyad Alawi said. Officials said the likelihood was that an aide or bodyguard to a Sunni parliamentarian facilitated the entry of the suicide bomber. Over the last two years, aides to several Sunni and Shi'ite parliamentarians were arrested and identified as insurgents aligned to either the former Saddam Hussein regime or Iran. "The investigations are ongoing inside the parliament," parliamentarian Hasan Senaid, a Shi'ite, said. "So far, three workers from the cafeteria have been detained." On Friday, parliament scheduled an emergency session in the Green Zone. Few parliamentarians, however, attended the session, held on the Muslim Sabbath. The last bombing in the Green Zone was in 2004 when seven people were killed in an attack credited to Al Qaida. Since then, the United States secured access to the area, which contains the Iraqi government complex as well as the American embassy. Officials acknowledged that the penetration of the Green Zone marked a major success for Sunni insurgents. They said the insurgents overcame numerous checkpoints, where visitors undergo inspection for metal and explosives. But over the last six months, an official said, the government identified an erosion in security around parliament. He said bodyguards of parliamentarians forced their way past Iraqi guards without being properly searched. Earlier, at least 10 people were killed when a suicide bomber detonated a truck full of explosives on a bridge over the Tigris River. The bridge collapsed, sending cars into the river. Officials raised the likelihood that the suicide bomber was granted entry by Iraqi staffers in the Green Zone. They said two suicide explosive vests were found in parliament after the attack. "There are some groups that work in politics during the day and do things other than politics at night," Iraqi government spokesman Ali Dabbagh said.