A bomb blast in central Athens has damaged an estate agency office, linked to the government. No injuries were reported.There was no immediate claim of responsibility but suspicion falls on far-left militant groups that have stepped up bombings and shooting attacks in recent weeks. The blast happened at 9:30pm local time last night near the Athens police headquarters and Supreme Court buildings. Police said the explosives had been placed in a plastic bag tied to a pole near the entrance of the building. Greek authorities have faced an upsurge in violence by domestic militant groups in the wake of major riots in December, sparked by the police’s fatal shooting of a teenager. The estate agency which was targeted in the attack handles government property and is supervised by the Finance Ministry.