On Monday, the President will host Prime Minister Borisov of Bulgaria at the White House.

WHITEHOUSE: The White House

During her official visit, the Director-General will hold meetings with the President of the Republic of Bulgaria Rosen Plevneliev, Prime Minister Boyko Borissov, Minister of Foreign Affairs Nikolay Mladenov, Minister of Culture Vezhdi Rashidov, Mayor of Sofia Jordanka Fandakova, as well as prominent Bulgarian intellectuals.

UNESCO: MEDIA SERVICES

In the wake of the bombing, Bulgaria's prime minister said there was "no chance" of detecting the group's activities before the attack.

BBC: Netanyahu: Hezbollah planning 'global terror attacks'