Israeli Prime Minister Benjamin Netanyahu called it "an Iranian terror attack" and others agree. According to the AP, Israeli Foreign Ministry spokesman Jonathan Rosenzweig said a flight from Tel Aviv had landed at 4:45 p.m. at the airport and that the blast took place about 40 minutes later. The tourists were apparently boarding the buses to go to their hotels. ... This bombing coincided with the 18th anniversary of the bombing of a Jewish community center in Argentina that killed 85 people.
The explosion took place Wednesday in the Black Sea city of Burgas, some 400 kilometers (250 miles) east of the capital, Sofia. ...
The Israeli premier noted that Wednesday's attack followed similar attacks or attempted attacks in India, Georgia, Thailand and Kenya and Cyprus in recent months. He said that once again, "all signs point to Iran," though he did not offer any evidence to back up the claim.
Via the BBC:
"I arrived at the airport about half-an-hour after the explosion, and saw three buses completely burnt out - just the metal bars were left," Bulgarian journalist Dobromir Dovkacharov said.
"There were crowds of people around, very distressed. One man said he saw decapitated heads. Others spoke of body parts flying through the air," he added.