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Newly appointed Tunisian Prime Minister Ali Larayedh addresses reporters during a press conference held in Tunis, Tunisia, Tuesday, Feb. 26, 2013. Four suspects belonging to a radical Islamist group have been arrested for their alleged involvement in the murder of a leftist politician that plunged the country into a crisis, but the killer himself remains at large, Tunisia's Interior and Prime Minister said Tuesday. Ali Larayedh said the Tunisian suspects, some of whom had been arrested in the last 48 hours, were accomplices to the murder and that the identity of the assassin is known. (AP Photo/Hassene Dridi)

Associated Press
Newly appointed Tunisian Prime Minister Ali Larayedh addresses reporters during a press conference held in Tunis, Tunisia, Tuesday, Feb. 26, 2013. Four suspects belonging to a radical Islamist group have been arrested for their alleged involvement in the murder of a leftist politician that plunged the country into a crisis, but the killer himself remains at large, Tunisia's Interior and Prime Minister said Tuesday. Ali Larayedh said the Tunisian suspects, some of whom had been arrested in the last 48 hours, were accomplices to the murder and that the identity of the assassin is known. (AP Photo/Hassene Dridi)
Newly appointed Tunisian Prime Minister Ali Larayedh addresses reporters during a press conference held in Tunis, Tunisia, Tuesday, Feb. 26, 2013. Four suspects belonging to a radical Islamist group have been arrested for their alleged involvement in the murder of a leftist politician that plunged the country into a crisis, but the killer himself remains at large, Tunisia's Interior and Prime Minister said Tuesday. Ali Larayedh said the Tunisian suspects, some of whom had been arrested in the last 48 hours, were accomplices to the murder and that the identity of the assassin is known. (AP Photo/Hassene Dridi)
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