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 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.
Police in Athens had to close down Panepistimiou Street for an hour or so on Friday morning after a bomb threat by an anonymous caller.
The 100 emergency service received a call at around 6.30 in the morning warning that a bomb was timed to go off in 40 minutes outside Number 12, the neoclassical edifice that is home to Greece's Numismatic Museum.
French police have detained a woman at a hospital in Dunkirk after she made a bomb threat and sparked a security scare, reported Reuters.
Police said in a statement that the woman made the threat after entering the hospital's emergency care unit.
Hospital workers alerted the police, who sealed off the area and deployed a bomb-disposal team.
An unidentified caller telephoned a bomb threat to police at noon Wednesday, warning that there would be an explosion in busy Kolonaki Square, central Athens, at 1.27 p.m.
The caller phoned the threat to the police's emergency number 100. Officers were dispatched to the scene but found no suspicious devices at the site and the deadline elapsed with no explosion taking place.
Police closed down and evacuated two stations on the Athens metro system on Thursday in response to two anonymous bomb threats.
Bomb-disposal experts have been dispatched to Egaleo and Aghia Marina stations after two callers told the police shortly after 1.30 p.m. that two explosive devices were timed to go off at the stations at 3.40 p.m.
Police on Tuesday cordoned off a large part of Syntagma Square in front of Parliament in Athens as they investigated a bomb threat.
An unidentified man called the offices of a newspaper shortly after 2 p.m. on Tuesday, warning that a bomb had been placed at a bank on Othonos Street and was rigged to go off an hour after the warning.