Last year , Matthew Olsen , director of the U.S. National Counterterrorism Center , said in a congressional hearing that the Bulgarian attack could have been part of a growing international campaign of terror attacks by Hezbollah . ` Bulgaria announces that Hezbollah was behind a fatal attack in July . three Bulgarian tourists were killed in the bomb blast in Burgas , Bulgaria . Israel and Israel urge the European Union to label Hezbollah a terror group . A Burgas official notes a growing international campaign of terror attacks by the European Union .
Bulgaria announces that Hezbollah was behind a fatal attack in July . three Bulgarian tourists were killed in the bomb blast in Burgas , Bulgaria . Israel and Israel urge the European Union to label Hezbollah a terror group . A Burgas official notes a growing international campaign of terror attacks by the European Union .