Eight people, including a man believed to be a suicide bomber, were killed and more than thirty others were injured after a bus picking up Israeli tourists from Burgas Airport exploded Wednesday afternoon.
Thirty-two people remain hospitalised, interior minister Tsvetan Tsvetanov said Thursday morning.
One of the victims - a man with a fake Michigan driving licence whose identity has still not been established - is most probably the suicide bomber who carried out the terror attack, prime minister Boiko Borisov told the state-run Bulgarian National Television (BNT) on Thursday morning.
Reacting to the attack on Wednesday, Israeli prime minister Benjamin Netanyahu said that Teheran was behind the attack and that Israel will react powerfully against Iranian terror.
In the beginning of this year Israeli officials warned that Bulgaria, a popular holiday destination for Israeli tourists, was vulnerable to an Islamist terror attack.
Tighter security has been introduced at all Bulgarian airports, railway stations and post offices, the transport ministry said. The Burgas airport remains closed to traffic and all flights are being redirected to the Varna airport.