Jurgen Roth, a top German investigative journalist, who made headlines over the last year with his book "The new Bulgarian Demons", has called on the country's prime minister to investigate the business group TIM.

In a letter to Prime Minister Boyko Borisov, published on his blog, Jurgen Roth expresses the belief that he will keep his promises for a crackdown on organized crime and corruption that secured him the election victory this summer.

Roth's letter has been triggered by dozens of alerts by citizens of the coastal town of Varna, who oppose the highly controversial sale of thousands of square meters of land in the Sea Garden of the town, one of its landmarks. The citizens told the German journalist that they have been pressed by people close to the TIM group, buyer of the land.

Roth recalls in his letter his last year meeting with Vanyo Tanov, former head of the National Service for Combating Organized Crime, who is currently head of the Customs Agency.

"I remember what Vanyo Tanov said to me - that there was a political umbrella over the activities of TIM group. That is the reason why he has been hampered in his efforts to lead investigations against the group."

Roth also recalls his meeting with Prime Minister Boyko Borisov, which took place after the presentation of his book "The new Bulgarian Demons".

"During our conversation I shared with you that in my opinion TIM group epitomizes the most modern form of organized crime, which is an example of what has been described as "Mafia Borghese", a structure which has spread into the uppermost levels of the society. At that time you did not deny this."

Just a day ago General Vanyo Tanov said that in the last twenty years the Bulgarian Customs have been ruled by organized criminal groups, but refused to disclose names.