Evtim Kostadinov, Head of Bulgaria's Files Commission, the panel investigating the Communist era records, is firm Bozhan Stoyanov, deputy minister in charge of the energy sector in Bulgaria's caretaker government, was a collaborator of the former Communist State Security.

Kostadinov says the evidence is irrefutable and there was not a single reason to doubt it.

He was swift to react in the aftermath of the emergency briefing called by caretaker Prime Minister, Marin Raykov, where the latter firmly denied reports Stoyanov has been involved with the State Security.

Kostadinov insists the evidence includes a recruitment report, Stoynov's recruitment registry card, and a file stamped by the Communist Interior Ministry.

The Files Commission announced Wednesday that in 1988 Stoyanov has been recruited under the alias Mladenov on grounds of documents they found about his lead officer and a personal file.

Bulgaria's Minister of Economy, Energy and Tourism Assen Vassilev was quick to send a letter to the commission's head, asking for clarification.

"A 2008 probe of the Files' Commission concluded there was no evidence Mr Stoyanov was a collaborator of the communist secret police," the letter claims.

The Files Commission Head explained Thursday that the above has been valid 5 years ago, but at the time they were unable to check the archives in the way they have done it now. The new evidence has been established in 2013.

He informed that in 2008, the panel requested from the Interior Ministry to send them all documentation on Stoyanov, if they had any, and received an answer such documentation did not exist.

In 2009, the Files Commission, however, was given the Interior Ministry's log files and in 2010 an agreement has been signed and the panel obtained the full archives for the agents.

"Obviously, in 2008, someone from the Interior misled the Commission," Kostadinov concluded.