Bulgaria condemned the terrorist attack in the capital city of Yemen, Sana\'a, that took the lives of dozens, according to a statement of Bulgaria\'s Foreign Ministry. \"We call on the Yemen authorities to investigate the accident quickly and to take control on violence. Peaceful dialogue is the only possible way for solving the problems on the eve of the 22nd anniversary since the unification of North and South Yemen,\" the Ministry\'s spokesperson Vessela Cherneva said.