Greek police evacuated the Ministry of Foreign Affairs in Athens on Friday after a suspect package arrived by mail, police officials said.
Police said a bomb squad was on its way to the area.
"A package has been found which is considered suspect," a police official told Reuters. "It arrived by mail."
No further information was immediately available. The ministry of foreign affairs is in central Athens, in a building complex opposite the Greek parliament.
Small-scale attacks on businesses, state buildings, police and politicians are frequent in Greece, which has a long history of political violence.