ALBUQUERQUE, N.M. (AP) — Law enforcement officials on Wednesday disputed a Southern Poverty Law Center report asserting that a gunman in a deadly New Mexico school shooting had been influenced by white supremacist views.

The Alabama-based organization known for tracking hate crimes included William Atchison, of Aztec, on a list of 13 assailants that the nonprofit says had been influenced by the alt-right, a fringe movement that's a mix of white nationalist, white supremacist, anti-Semitic and anti-immigration beliefs.

Atchison, 21, killed two high school students — Francisco I. Fernandez and C...