Updated Oct. 24, 2023 8:24 pm ET

U.S. Secretary of State Antony Blinken warned Tuesday that Washington would react “swiftly and decisively” if Iran or its proxy forces attack U.S. personnel after Tehran raised the risk of a larger Middle East conflict in recent days by unleashing the regional militias it has spent years arming.

For more than six months, these Iranian-backed militia groups refrained from launching drones or rockets against American troops in Iraq and Syria, as part of what appeared to be an undeclared truce between Tehran and Washington. 

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