On Wednesday, an FBI operation killed a guy who had made online threats against President Joe Biden and other authorities.
Agents were attempting to serve an arrest warrant on Craig Robertson at his home in Utah, just hours before Mr Biden was scheduled to visit the state.
According to the criminal complaint, Robertson made threats on Facebook against Mr. Biden and a prosecutor investigating Donald Trump.
The FBI declined to provide more information.
The raid happened at about 06:15 local time in Provo, about 40 miles (65 km) south of Salt Lake City.
A criminal complaint outlined messages that Robertson made on Facebook including pictures of guns and threats to kill Mr Biden and Alvin Bragg, the Manhattan district attorney leading an investigation into a hush-money payment by Mr Trump to an adult film star.
According to the complaint, other messages targeted US Attorney General Merrick Garland and New York Attorney General Letitia James.
Mr Biden will make his first visit to Utah as president on Thursday, with a visit to a veterans’ hospital and a fundraising event in Park City.