JERUSALEM - Israeli Prime Minister Benjamin Netanyahu on Wednesday accused Iran of being behind the attack that killed at least three Israelis and left more than 20 wounded at the Burgas airport in Bulgaria.

Netanyahu said that Israel's response to this attack will be harsh.

"This is an Iranian terror offensive that is spreading throughout the world," he said, warning that Israel will issue a " strong response against Iranian terror," Netanyahu said in a statement.

"In the past months we saw Iranian attempts to attack Israelis in Thailand, India, Kenya, and Cyprus. Exactly 18 years after the attack on a Jewish community center in Argentina, the Iranian terror continues to hurt innocent people," Netanyahu said, referring to a massive car bombing in Buenos Aires that killed 85 people and wounded hundreds more on July 18, 1994.

Earlier in the day, at least three people were killed and many wounded as a powerful blast ripped through a bus with Israeli tourists at Burgas airport, according to Bulgaria's Interior Ministry.