The 67-year-old entered his neighbours' house in a suburb of the capital, Sofia, late yesterday and opened fire with a handgun, police said today.
A 26-year-old man was killed on the spot, while two women aged 28 and 56 died of their wounds in the hospital. A 22-year-old man was hospitalised with life-threatening injuries.
It was not immediately clear what prompted the fatal attack, but witnesses say there were frequent conflicts between the neighbours.
Police have been deployed in the area to prevent more bloodshed as Roma families have threatened to take revenge.
Sofia: Police say a Bulgarian retired army officer opened fire on a Roma family who lived next door to him, killing three people and seriously wounding a fourth, before turning the gun on himself.
First Published: Tuesday, March 19, 2013, 20:02