Several readers asked whether Mexico and Canada sent support to California as destructive wildfires burn in the Los Angeles area. That’s true.

A doorstep video released by The Associated Press and others shows a fire at the base of a hilltop electrical pylon in Altadena, California—what residents say was the origin of the Eaton fire. Within minutes, high winds had carried the fire across the neighborhood and the sky was soon lit red with intense burning.