An explosive device went off outside the Greek parliament in Athens on Sunday, but no one was injured and no damage was immediately reported, police said.
The device exploded around 8:00 pm (1800 GMT) and was preceded by a telephone call to the Eleftherotypia newspaper warning of the blast.
Police evacuated the area around the site where passers-by normally stroll close to the monument of the Fallen Soldiers guarded by the presidential Evzones guards.
The explosives went off 10 minutes after the call was given by the anonymous caller. He said the device was hidden in a garbage bin.