Iran threatens to hit US bases in the Middle East: What is the threat level?

Iran on Friday said the U.S., as a "backer" of Israel, "shall be held fully accountable" for the series of strikes Jerusalem levied overnight against Tehran, its nuclear and military facilities, and top officials – deepening retaliatory concerns over U.S. bases near Iran.

The U.N. Mission to Iran sent a letter to the United Nations Security Council condemning the attacks that killed four military commanders, one Iranian official allegedly involved in the nuclear talks with the U.S., and two nuclear scientists, and said that Israel’s "conduct" in the region "poses a serious threat to international security."

But earlier this week, just days ahead of a planned meeting between Washington and Tehran in Oman to discuss nuclear negotiations, Iranian De...