The rise of domestic extremism in America

Data shows a surge in homegrown attacks not seen in a quarter-century.

Domestic terrorism incidents have soared to new highs in the United States, driven chiefly by white-supremacist, anti-Muslim and anti-government extremists on the far right, according to a Washington Post analysis of data compiled by the Center for Strategic and International Studies.

The surge reflects a growing threat from homegrown terrorism not seen in a quarter-century, with right-wing extremist attacks and plots greatly eclipsing those from the far left and causing more deaths, the analysis shows.

The number of...