A deadly blast that struck a bus carrying Israeli tourists in Bulgaria on Wednesday killed seven people and wounded more than 30 others. The bus passengers were mostly youths. Witnesses told Israeli TV that someone boarded the bus and a huge explosion immediately followed. “All signs point to Iran,” says Israeli Prime Minister Benjamin Netanyahu, promising a strong response to the attack. This “is an Iranian terror attack that is spreading across the world. Israel will react strongly to Iran’s terror.” The incident coincides with the anniversary of 1994 attack on a Jewish center in Buenos Aires that left 85 people dead.