Dan Senor, senior national security aide to Mitt Romney, speaks to the press en route to Israel from London on Saturday. Jason Reed/Reuters /Landov hide caption

itoggle caption Jason Reed/Reuters /Landov

A screen grab from the surveillance video showing the man who it's suspected set off a bomb aboard a bus full of Israeli tourists in Burgas, Bulgaria. BGNES.com hide caption

itoggle caption BGNES.com

An undated screen grab, released by the Kaspersky Lab, showing some of the programming behind Flame. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images

International Atomic Energy Agency Director-General Yukiya Amano earlier today in Vienna, after his return from talks in Tehran. Dieter Nagl /AFP/Getty Images hide caption

itoggle caption Dieter Nagl /AFP/Getty Images