UPDATE:
SOFIA, Bulgaria (AP) — The Bulgarian Foreign Ministry says that the death toll in an explosion on a bus carrying Israeli youth has risen to six, and that 32 people also were wounded.
JERUSALEM (AP) — Israel's prime minister has blamed Iran for the deadly blast that struck a bus of Israeli tourists in Bulgaria and is promising a tough response.
Benjamin Netanyahu says "all signs point to Iran" in Wednesday's blast in the Bulgarian Black Sea city of Burgas, some 400 kilometers (250 miles) east of the capital, Sofia.
At least three Israeli tourists were killed.
Netanyahu noted that the attack follows similar attempts in India, Georgia, Thailand, Kenya and Cyprus in recent months.
He said "this is an Iranian terror attack that is spreading across the world" and that "Israel will react strongly to Iran's terror."
