As U.S. President Donald Trump re-imposed harsh economic sanctions on Iran last month, hackers scrambled to break into personal emails of American officials tasked with enforcing them, The Associated Press has found — another sign of how deeply cyberespionage is embedded into the fabric of US-Iranian relations.

The AP drew on data gathered by the London-based cybersecurity group Certfa to track how a hacking group often nicknamed Charming Kitten spent the past month trying to break into the private emails of more than a dozen U.S. Treasury officials. Also on the hackers' hit list: high-profile defenders, detractors and enforcers of the nuclear deal struck between Washington and Tehran, as well as Arab atomic scientists, Iranian civil society figures and D.C. think tank employees.

Read more: ABC News