India, April 29 -- Police in Greece's capital were searching for a gunman, reportedly aged 89, who opened fire on Tuesday in a social security office and a courthouse in central Athens, wounding at least four people.

Armed with a shotgun, the gunman initially opened fire at the social security office, wounding an employee, police said. Police officers who arrived at the scene treated the man, but the gunman fled the scene.

Local media aired security camera footage that it said was from a local store near the social security office, which showed a man walking calmly across the street carrying what appears to be a short-barrelled shotgun in his right hand.

The same man was suspected of later opening fire on the ground floor of a court bu...