Bulgaria's Prime Minister Boyko Borisov has ordered swift investigation into the blasts near the offices of two opposition parties in downtown Sofia, while making it clear he is unperturbed by the incident.

"There are broken windows and a lot of fuss just a day before the report of the European Commission. It is easy to see that this is a blast against Bulgaria, rather than the offices of the parties," Borisov told the morning broadcast of TV 7 channel.

The first blast went off at 3:58 a.m. on Tuesday in front of the headquarters of the conservative Order, Law and Justice Party, RZS, in central Sofia.

About twenty minutes later another explosion ripped off the air in front of an office of the party of former Prime Minister Ivan Kostov, the die-hard rightist Democrats for Strong Bulgaria.

No casualties were reported, but neighboring buildings have been damaged.

The blasts come just a day after Bulgaria's centrist and leftist opposition tabled in parliament a no confidence motion against the cabinet of Boyko Borisov, which the two targeted parties are expected to support.

Rumors have emerged, suggesting that the blasts are a PR trick, masterminded by the parties themselves, and drawing parallels to the bomb that exploded in front of the offices of Galeria, an anti-government newspaper, early on February 10 in downtown Sofia.

Prime Minister Borisov has hinted that the marginal conservative party RZS ("Order, Law and Justice Party") might have been behind the blast against the anti-government Galeria weekly in February.

RZS is also believed to have certain connections with Aleksei Petrov, and in January the party leader Yane Yanev contributed to the Tapegate by releasing himself several tapes of discrediting conversations of government officials.

Prime Minister Boyko Borisov took office in the summer of 2009, pledging to curb corruption and organized crime after criticism from Brussels.

Just as in February the blasts against the opposition parties precede the European Commission's report on Bulgaria's efforts to fight graft, due to be released on Wednesday.

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