Investigators in Bulgaria are seeking clues to the identity of a suicide bomber . Minister : ` ` This is a cruel , deliberate and well - orchestrated wave of terrorism '' The man was a foreigner who entered Bulgaria with false papers , the interior minister says . Israel 's U.S. Embassy said Wednesday that it had no proof that Iran was the instigator of the attack . Israel has accused Hamas and Hezbollah in the attack , a claim denied by Bulgaria .
Investigators in Bulgaria are seeking clues to the identity of a suicide bomber . Minister : ` ` This is a cruel , deliberate and well - orchestrated wave of terrorism '' The man was a foreigner who entered Bulgaria with false papers , the interior minister says . Israel has accused Hamas and Hezbollah in the attack , a claim denied by Bulgaria .