In the days leading up to the attack on the U.S. Capitol, the FBI received intelligence that extremists were planning violence as lawmakers gathered in Washington to certify the electoral victory of President-elect Joe Biden.

FBI officials managed to dissuade people in several places from their suspected plans, a senior FBI official said — but there was not enough evidence to issue arrest warrants.

“Prior to this event, the FBI obtained information about individuals who were planning on potentially traveling to the protests, individuals who were planning to engage in violence,” said the senior FBI official. “The FBI was able to discourage those individuals from traveling to D.C.”

Read more at ProPublica.