The ministry asked for the public's help in finding the suspects, but refused to divulge additional details as to their role in the attack's execution.
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According to the ministry, the two are Maliad Farah (also known as Hussein Hussein), 33, an Australian national, and Hassan al-Haj, 25, a Canadian.
Hassan al-Haj (R), Maliad Farah
The statement related that they were seen in various sites in Bulgaria between June 28 and July 18, 2012.
According to suspicions, they used fake IDs to register in hotels and rent cars.
"Citizens with information on the incident are invited to the nearest police station. Their anonymity is assured," the Bulgarian news website Novinita reported.
Bulgarian Interior Minister Zeitlin Yovchev refused to give further details on the investigation and the search for the suspects, saying that he cannot shed more light as it would harm the investigation.
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