SOFIA, Bulgaria (AP) — A bomb exploded on a bus carrying Israeli youth in a Bulgarian resort Wednesday, killing at least six people and wounding 32, officials said. Israeli Prime Minister Benjamin Netanyahu called it “an Iranian terror attack” and promised a tough response.

The explosion took place in the Black Sea city of Burgas, some 400 kilometers (250 miles) east of the capital, Sofia. TV images showed smoke billowing from the scene – a parking lot at the local airport where the Israeli tourists had landed shortly before the blast. Several buses and cars were on fire near the shell of the exploded vehicle. …

No group immediately claimed responsibility. But Israelis often have been targeted outside their country, and Wednesday’s attack coincided with the 18th anniversary of the bombing of a Jewish community center in Argentina that killed 85 people.