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Both far-left and far-right attacks hit groundbreaking levels in 2020, the database shows, with far-right incidents still the much larger group.

The 73 far-right incidents were an all-time annual high in the CSIS database, which goes back to 1994.

Left-wing attacks reached 25 in 2020. Those incidents include multiple attempts by extremists to derail trains to hinder oil pipeline construction and at least seven incidents in which police and their facilities were targeted with guns, firebombs and graffiti. The incidents included the burning of a Minneapolis police precinct during protests over the death of George Floyd.

Pastor Kenneth Robinson stands in front of a section of Briar Creek Road Baptist Church in Charlotte that was set on fire in 2015. (Logan Cyrus for The Washington Post)

In August, a supporter of President Donald Trump was shot dead in Portland, Ore., by a suspected gunman who was a self-described antifa supporter. That killing was the only death last year attributed to far-left violence, the data shows. There were two deaths attributed to far-right attacks.

The Jan. 6 riot at the Capitol spurred renewed national attention on domestic terrorism and on hate-driven violence.

The Post focused its analysis primarily on far-right attacks since 2015 because they account for a clear majority of the rising domestic terrorism events and fatalities charted by the CSIS.

The far-right incidents last year broke into distinct waves emerging amid government shutdowns in the spring, widespread racial demonstrations in the summer and confrontations over the presidential election results in the late fall, The Post’s review of the CSIS data shows.

The CSIS database is one of the best public sources of information about domestic terrorism incidents, which the group’s analysts define as attacks or plots involving a deliberate use or threat of violence to achieve political goals, create a broad psychological impact or change government policy. That definition excludes many violent events, including incidents during nationwide unrest last year, because CSIS analysts could not determine whether attackers had a political or ideological motive.

Data released by the CSIS on Monday includes the Jan. 6 breach of the Capitol as one of 11 far-right terrorism incidents that month — the most for any January in the database. The new report highlights more involvement in far-right attacks and plots by military service members, veterans and current and former police officers, some of whom participated in the riot at the Capitol.

Following the Capitol incident, FBI Director Christopher A. Wray told federal lawmakers that confronting domestic terrorism is a top national security priority of the agency.

Nearly every state has seen at least one domestic terrorist attack or plot in recent years, The Post’s analysis of the database shows, a notable expansion of the communities afflicted by terrorism over prior decades.