The director of the Bulgarian State Agency for National Security (DANS), Tsvetlin Yovchev, has unexpectedly resigned.

Yovchev submitted his resignation on Wednesday, asking Prime Minister Boyko Borisov that he is dismissed from office before the end of his term.

The decision has been prompted by the government's consistent lack of trust in his skills, Yovchev said in his motives.

According to Yovchev he has failed to meet the prime minister's expectations as there was a clash over what the agency's priorities should be.

The news comes just days after a bomb exploded in front of the offices of Galeria, an anti-government newspaper, in downtown Sofia.

Right after the blast occurred last Thursday Prime Minister Boyko Borisov instructed Interior Minister Tsvetan Tsvetanov and DANS head Tsvetlin Yovchev to take urgent measures and arrest the masterminder. He pointed out his assessment of the work of the two top cops will depend on their performance with respect to the Galeria explosion.

Last month Galeria published transcripts of taped phone conversations between senior government officials and Customs Office chief Vanyo Tanov, which prompted Prime Minister Boyko Borisov to seek and win a confidence vote in Parliament on Jan. 20.

The tapes, whose authenticity is still not verified, allege that the government of PM Boyko Borisov is favoring certain companies and individuals with respect to investigations and appointments in the Customs Agency.

Yovchev was appointed Director of DANS after the prime minister accepted the resignation of the former head Petko Sertov at the beginning of August 2009. He took office on August 10 after President Georgi Parvanov issued a decree for his appointment.

When DANS was created in January 2008, Yovchev became the head of the Counter-Intelligence Directorate. He resigned in October 2008, citing personal reasons.

Asked for comment, Sertov said he was surprised by Yovchev's resignation.

"He is a very well read and qualified for the post, a man who is always up to date and in tune with the times and whom I expected to take the agency up to the level it deserves."

Sertov pointed out that there is not a single agency in the world, which can totally prevent information leakages.