**A makeshift bomb has caused significant damage to the office of a Greek far-right group in Athens, police say.**A local newspaper received a warning shortly before the bomb exploded outside the fifth-floor office of the group, Chryssi Avghi.
No injuries were reported and there was no immediate claim of responsibility.
Chryssi Avghi, which means Golden Dawn in Greek, has reportedly been accused by left-wing groups of attacks against immigrants and anti-racist militants.
The device that exploded early on Friday was packed in a shoe box, reports said.
There have been a number of home-made bomb attacks blamed on Greek far-left militants or anarchists.
Recent attacks have targeted symbols of the state and banks.
Greece has faced severe anti-government protests and rioting since police shot dead a teenager in December 2008.