"Ahmed Dogan is in good health. Everything is under control," MRF official Ceyhan Ibryamov told journalists. Police said they had arrested a 25-year-old man from the Black Sea town of Burgas who was also carrying two knives.
The liberal MRF party represents ethnic Turks and other Muslims who make up about 12 percent of Bulgaria's 7.3 million-strong population. Dogan is seen as one of Balkan country's most influential political figures. The MRF was a junior partner in the previous Socialist-led cabinet.
In 1996, former Prime Minister Andrei Lukanov was found shot dead near his home in Sofia, though attacks on politicians are rare.