US intelligence warns Iran has advanced plots to target American personnel worldwide

The United States has been alerted to a significant escalation in Iranian activity aimed at American personnel. In a memo dated 23 October, Director of National Intelligence Jay Clayton warned Secretary of State Marco Rubio that Iran has substantially increased efforts to target US staff and that lethal plotting against American citizens has reached "advanced stages" in the Middle East and other countries. The warning followed a recent decision by Washington to scale back staffing at its embassy in Saudi Arabia, a move made in response to intensified attacks by Iran‑aligned Houthi forces.

The memo, seen by Reuters and confirmed by US officials, also noted that the threat level to Americans in the region is the highest since the conflict that began in February 2026. In addition to the Middle East, the intelligence community indicated that Iranian plans could extend to Europe and other locations, though specific targets were not disclosed.

Background

The alert comes amid an eight‑month‑old regional conflict that started after Iran launched a war in early 2026. Iran‑backed Houthi militants have stepped up attacks on commercial shipping in the Strait of Hormuz, prompting the US to reassess its diplomatic and military posture in the Gulf. Earlier in October, sources told Reuters that Iran was preparing a more forceful response if the United States resumed large‑scale military strikes on Iranian territory.

The memo was authored by Jay Clayton, who succeeded previous directors under the Trump administration. It was addressed to Secretary of State Marco Rubio, who has been receiving regular briefings on the evolving threat. US agencies, including the CIA, have been monitoring Iranian militia activities such as the Basij, which were publicly displayed in a military march in Tehran in September 2026.

Why it matters

The heightened threat directly impacts US diplomatic and military personnel stationed across the Middle East and potentially in Europe. The US State Department has placed employees on heightened alert and reduced personnel levels at embassies and consulates, starting with the Saudi mission. President Donald Trump and senior aides have been briefed on the intelligence, underscoring the political significance of the issue.

Analysts note that the advanced stage of the plots represents the most serious risk to American citizens since the war began, raising concerns about the safety of ambassadors, consular staff, and other officials. The escalation also adds pressure on US policy decisions regarding further military action against Iran, as any retaliation could provoke additional Iranian retaliation against US personnel.

What happens next

US officials indicated that the intelligence community will continue to monitor Iranian activities closely. The memo suggests ongoing assessments of threat levels and possible further adjustments to diplomatic staffing. No specific dates for additional actions were provided, but the US government has signalled that it will maintain heightened vigilance and may consider further security measures for its personnel abroad.

The situation remains fluid, with US agencies tracking Iranian planning and preparing contingency responses as the conflict approaches its ninth month.