A total of 109 staffers working with Hillary Clinton were attacked by Russian military hackers last year, a cybersecurity expert has told U.S. lawmakers. Thomas Rid, a professor at King’s College in London, made the statement before US Senate intelligence committee, which is investigating Russia’s alleged interference in the 2016 election.

MotherJones reported that Rid explained how efforts by Russian military intelligence — GRU — directly targeted Clinton. “GRU targeted Hillary Clinton’s personal email account at least two times in March, but the available data show that she did not fall for the password reset trick. Between March 10 and April 7, GRU hit at least 109 Clinton staffers with 214 individual phishing emails,” he said.