The offices of a Greek private television channel and newspaper came under a bomb attack early Monday, the newspaper reported.
Local daily Kathimerini reported unknown assailants detonated a bomb at its office and SKAI TV in the wee hours.
No casualties were reported as the offices had been emptied but the building suffered extensive damage.
Before the explosion, the assailants in a phone call gave a bomb threat to another news website and television channel, prompting authorities to evacuate the building and close the street in front of it to traffic.