As stories of those lost in Wednesday’s terror attack against Israeli tourists in the Bulgarian city of Burgas emerged Thursday, Israeli Prime Minister Benjamin Netanyahu pointed a finger at Iranian-backed terror cells, warning his country that the bus bombing followed attempted attacks in Thailand, India, Georgia, Kenya and Cyprus.

“Exactly 18 years to the day after the horrendous attack on the Jewish Community Center in Argentina, deadly Iranian terrorism continues to strike at innocent people,” said Netanyahu. “This is a global Iranian terror onslaught and Israel will react firmly to it.”

People around the world learned of Itzik and Gilat Kolangi, a young couple who were on their first holiday since the birth four months ago of their daughter Noya, and their friend Amir Menashe, whose wife Natali survived the attack. Yitzchak and Kochava Shriki, who were expecting their first child, were also killed when the suicide bomber exploded his charge on a tourist bus populated primarily by Israelis who had arrived moments earlier on a flight from Ben Gurion Airport.

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The Bulgarian bus driver was also killed in the attack, while 32 Israelis were wounded. All except two were evacuated to Israel, according to the Ministry of Foreign Affairs.

“U.S. President Barack Obama called Prime Minister Benjamin Netanyahu and expressed his condolences over the deaths of Israelis in the terrorist attack in Bulgaria,” the ministry said in a statement. “The two agreed that Israel and the U.S. would work together in investigating the attack.”

Bulgarian Prime Minister Boyko Borissov also called Netanyahu to convey his condolences and pledge cooperation in the investigation.

In Israel, teams from the Chabad Terror Victims Project fanned out across the country to provide support to those affected by the attack.

“CTVP will go to the homes of their families to bring comfort and support, and provide help and assistance during this time of terrible grief,” the organization, run under the umbrella of the Chabad-Lubavitch Youth Organization in Israel, said in a statement. “When needed, we will do everything required to assist in organizing the [mourning rites] for the family.”