SOFIA — Anti-Gypsy demonstrations that began during the weekend continued to spread across Bulgaria on Tuesday evening in response to the killing of a man by a minibus whose driver is linked to a man accused of being a Roma crime boss.

Prime Minister Boyko M. Borisov and his main political rival, President Georgi S. Parvanov, made a show of bipartisan unity Monday in visiting Katunitsa, the village where the killing happened on Friday. Protesters had burned houses and cars belonging to the family of the supposed crime boss, Kiril Rashkov, while demanding that the authorities “deport” the family from the village, which has a population of 2,300.

“Ethnic peace is the only way to guarantee Bulgaria’s prosperity,” Mr. Borisov told a meeting of government ministers on Tuesday. “Every other action guarantees the failure of the country and falling into deep isolation.”

The news media referred to the protests as “pogroms.” The protesters shouted racist slogans like “Gypsies into soap” and “Turks under the knife.”