A bus carrying Israeli tourists in a Bulgarian resort city exploded Wednesday. Although numbers have not been confirmed, reports say the explosion left seven dead and 20 wounded. The attack occurred in Burgas, some 250 miles east of Sofia, a resort city on the Black Sea popular with Israeli tourists.

Lubavitch.com spoke with Rabbi Yosef Solomon Chabad representative in Sofia, as he was fielding calls from family members in Israel desperate for news about their loved ones. “Chabad representatives are at the scene in Burgas, and at the hospitals, helping in every way,” Solomon said. Israeli government officials are also in contact with Chabad of Bulgaria.

According to some reports, the bus may have been an airport shuttle carrying vacationers. The city’s mayor reportedly said that the explosives were stored at the back of the bus, and reports by eyewitnesses say someone boarded the bus before the explosives went off.

“We are doing whatever we possibly can to help in the midst of this chaos,” Solomon said. Chabad of Burgas has set up an emergency hotline for those seeking information about loved ones: +359888122749 

Burgas’s airport was closed down after the attack, and fire engines rushed to the scene to put out flames from the explosion.

The attack comes on the 18th anniversary of the terrorist bombing of the Jewish community center in Buenos Aires, which left 85 dead and hundreds wounded.

Bulgaria’s EU Commissioner Kristalina Georgieva said she was “shocked and saddened by the news about the explosion.” Israeli PM Benjamin Netanyahu blamed Iran for the attack, saying that “all signs point to Iran.”