One of Iraq's most powerful Sunni Arab politicians, under guard at his home, accused the Shi'ite-dominated government on Sunday of trying to silence him with what he described as virtual house arrest. Iraqi troops have surrounded the home of Adnan al-Dulaimi since shortly after the discovery of a car bomb near his office compound late Thursday. US and Iraqi officials said the keys to the vehicle were found on one of Dulaimi's bodyguards. His son, Maki al-Dulaimi, and about 30 other people were arrested Friday. "They want to keep me silent and not raise my voice to defend the rights of the Iraqi people and detainees," Dulaimi, head of parliament's largest Sunni bloc, told The Associated Press in a telephone interview from his house in western Baghdad.