Police on Friday morning shut down Parliament and cordoned off the area around it after a bomb threat was made by an anonymous caller.
The caller phoned the offices of the Zougla.gr news website, saying that explosive devices had been placed "inside and outside Parliament."
"There will be victims. Beware," the caller reportedly threatened.
Police officers and a bomb disposal unit were searching the office of main opposition leader Kyriakos Mitsotakis on Tuesday evening after someone call in a bomb threat.
Greek media said the threat came in around 6.45 p.m, prompting authorities to cordon off the area around the ND leader's office on 7 Efroniou street, in the central Athenisn district of Pangrati.
Police ordered the evacuation of the branch of National Bank off Syntagma Square near central Athens on Monday after an anonymous caller phoned in a bomb threat which turned out to be a hoax.
Members of the police's bomb disposal unit were dispatched to the scene to search for any suspicious devices but found nothing.