The United States flew two B-52 bombers over the Persian Gulf on Wednesday as a forewarning to Iran against any potential attacks against American or allied targets in the Middle East.

Additionally, the senior military official said there could be a “potential for other more complex attacks” against Americans in Iraq. “I think it is likely that the U.S. Embassy in Baghdad would be attacked again in some manner.”

He added, “We’re seeing planning for, particularly in Iraq for complex attacks that require Iranian assistance in order to be pulled off. It’s unclear to us, whether it’s contingency planning, or whether it’s a plan that is advancing because approval has been given and they’re just trying to get all the pieces in place and execute.”