MOSCOW  A car bomb in the South Ossetian capital of Tskhinvali killed seven Russian peacekeepers and two others on Friday, raising tensions in the separatist enclave days before a scheduled pullback of Russian troops from Georgian territory.

President Eduard Kokoity of South Ossetia said he had “no doubt” that Georgian special forces were behind the explosion. The acts, he said, “undermine international efforts to stabilize the situation and torpedo the Medvedev-Sarkozy plan.”

The blast comes six days before a Russian deadline to pull back from the so-called buffer zone outside South Ossetia, returning a large swath of land to Georgian control. European Union monitors began patrolling the buffer zone on Wednesday, in accordance with a cease-fire agreement brokered by President Nicolas Sarkozy of France and agreed to by Russia. President Dmitri A. Medvedev of Russia agreed to adhere to the timetable for withdrawal.

“The last terrorist act in South Ossetia proves that Georgia has not abandoned the policy of state terrorism,” Mr. Kokoity told the Interfax news agency.