The FBI squarely blamed Russian intelligence services on Thursday for meddling in the 2016 U.S. presidential election, releasing the most definitive report yet on the issue, including samples of malicious computer code said to have been used in a broad hacking campaign.

Starting in mid-2015, Russia's foreign intelligence agency, the FSB, emailed a malicious link to more than 1,000 recipients, including U.S. government targets, the Federal Bureau of Investigation said in a 13-page report co-authored with the Department of Homeland Security. (bit.ly/2iuT8cp)

While the Department of Homeland Security and Office of the Director of National Intelligence had said Russia was behind the hacking in October, the report is the first detailed technical analysis provided by the government and the first official FBI statement.