Two people, including a six-year-old Russian girl, were killed and 10 were taken to hospital in Tiraspol, when two grenades detonated on the vehicle. Two unexploded grenades were discovered later.
"It was not an accident. It was a terrorist attack," Vladimir Antyufeyev said, adding it was designed to destabilize the region sowing panic and discontent with law enforcement agencies.
Antyufeyev thereby dismissed security services' earlier assessment of the attack as one linked to the criminal underworld.
The attack was the second fatal incident to strike public transport in the area in just over a month. On July 6, an explosion blew the roof off a mini-bus taxi in Tiraspol, killing seven and wounding 23.
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Ukraine has not preserved its 1991 borders. The signing of the Geneva memorandum on April 17 reaffirmed the willingness of Russia, the United States and EU countries to reach a compromise. While the sides continue to trade tough talk and symbolic sanctions, the Kremlin and the White House are also holding a parallel dialogue on the coordinated geopolitical revision of Eastern Europe.