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Netanyahu said “all signs point to Iran” as behind the attack.

“Just in the last few months, we saw Iran attempting to hurt Israelis in Thailand, India, Georgia, Kenya, Cyprus and other countries. Exactly 18 years after the infernal terror attack in the Jewish community center in Argentina, the murderous terror of the Iranians continues to hurt innocent people. This is a terrorist Iranian aggression revealing itself all over the world. Israel will respond forcefully to the Iranian terror,” he said.

According to CNN, Netanyahu was holding a meeting with security advisers Wednesday night on Israel’s response.

Bulgarian news websites said as many as three buses caught on fire at Sarafovo Airport following the explosion.

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Police have closed down the airport. TV images showed smoke billowing from the scene — a parking lot at the local airport where the Israeli tourists had apparently just landed. Several buses and cars were on fire near the shell of the exploded vehicle.

The Israeli Foreign Ministry has confirmed there was casualties in the explosion, and officials are believed to be on the way to Bulgaria.

No group immediately took responsibility for the blast.

Deputy Foreign Minister Danny Ayalon said there was no advance intelligence on an attack in Bulgaria.

But counterterrorism expert Boaz Ganor said Iran and Hezbollah were the most likely culprits. He told The Associated Press that all the indications pointed toward them. He also cited the arrest of a Hezbollah operative in Cyprus in recent days who was suspected of preparing a similar attack.