US Secretary of State Hillary Clinton condemned the "heinous terrorist attack" against Israeli civilians in Bulgaria Wednesday "in the strongest terms."

"We offer our deepest condolences to the victims and their loved ones," Clinton said in a statement.

"The United States stands ready to offer any assistance necessary, and we will work with our partners in Bulgaria, Israel and elsewhere so that the perpetrators can be apprehended swiftly and brought to justice for this appalling crime."

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