Two powerful time bombs exploded at Athens' main court complex Friday in attacks the government linked to the trial of suspected members of Greece's deadliest terrorist group. The twin blasts, which injured a police officer and damaged a building in the closely guarded compound, also elevated concern among security officials preparing for the Athens Olympics, now less than a year away. A group calling itself Revolutionary Struggle claimed responsibility in a call to an Athens newspaper. It did not give a reason for the pre-dawn attack.