They threw a hand grenade outside the embassy building, located opposite Parliament on a major avenue. Circulation was halted in the area after attack. Anti-terrorism forensics experts combed the scene. the attack was apparently carried out by two people on a motorbike, according to footage from security cameras. A bike was found abandoned later in a central Athens neighborhood. It was unclear why the French Embassy was targeted. Next week the President Obama will travel to Greece for a visit and left-wing organizations announced protests. There was no immediate claim of responsibility for Thursday’s attack.. Small-scale attacks on businesses, police, politicians and embassies are frequent in Greece. The security measures during President’s Obama visit will be increased.