This is CNBC’s live blog covering the U.S.-Israel strikes on Iran, and Tehran’s counterattacks across the Middle East. CNBC’s reporters are covering the strikes from our bureaus in Washington, London, Singapore, San Francisco, and Englewood Cliffs, New Jersey. Head here for the previous day’s updates.

What you need to know

The U.S.–Israel conflict with Iran is intensifying, with Tehran’s security chief on Monday saying that negotiations with Washington were off the table.

Prospects of an escalation in Middle East tensions sent oil prices surging, with U.S. crude as well as global benchmark Brent rising more than 8%, before paring some gains, as investors assess risks to supply disruption. Safe‑haven gold climbed, while U.S. futures and Asian equity markets fell across the board.

Iranian state media reported more than 200 people were killed in Iran, while the U.S. has confirmed three American service members have died and five seriously wounded.