A 19-year-old girl from Radnevo stabbed her boyfriend with a kitchen knife, the Interior Ministry announced.
This happened during a scandal between the two.
The 28-year-old man is stabbed in the chest area.
He was transported to a hospital where he was placed in treatment, his condition is life-threatening. Doctors at UMHAT-Stara Zagora are fighting for his life.
Bulgarian prosecutors have requested permanent detention into police custody of four men charged with attempted murder during a scuffle between ethnic Bulgarians and Roma people in the town of Radnevo, in southern Bulgaria.
The four face jail terms of 15 to 20 years or life imprisonment if convicted.
Three policemen and four protesters suffered injuries after violent clashes broke out the rally in Radnevo, the Bulgarian interior ministry said on Thursday.
Around 2,000 people joined the protest on Wednesday evening, following an incident in which four men of Roma origin assaulted three Bulgarians in a street row on Monday.