Afghanistan, Oct. 24 -- US intelligence has found that Iran has substantially increased efforts to target American diplomats and officials in the Middle East and beyond, with some lethal plots reportedly reaching advanced stages, Axios reported.

The warning was detailed in an October 23 memo addressed to US Secretary of State Marco Rubio by Director of National Intelligence Jay Clayton, according to the report.

The memo said information about the alleged assassination plots should be shared with more US personnel who could be at risk. It did not identify specific targets, countries outside the Middle East or details of the alleged plans.

US officials said the intelligence concerns were among the reasons the State Department was reducing ...