In January 2012, Israel and Bulgaria signed two additional memorandum of understanding, which the purpose where one was for joint military training exercises and one for cooperation in the defence sector. The two agreements were signed by Israeli Defense Minister Ehud Barak and Bulgarian Defense Minister Anyu Angelov. Minister Angelov said the two agreements, in addition to their economic and defense benefits, also "bring a political message – Bulgaria and Israel are a step closer towards stronger cooperation and a strategic dialogue." After the 2012 Burga bus bombing, Bulgaria and Israel pledged to increase security relations between the two countries discussing various aspects of bilateral cooperation at a meeting at the Ministry of Interior between Bulgarian Deputy Prime Minister and Minister of Interior Tsvetlin Iochev and Israeli Foreign Affairs Minister, Avigdor Leiberman in November 2013. An international investigation led by Bulgaria has established was the work of people linked with the bombing to the military wing of Hezbollah where five Israeli tourists and a Bulgarian citizen died.