Overview
- The blaze began near Tecate Peak in Mexico on Monday and moved across the border into the Marron Valley area south of Dulzura around 10 a.m. Tuesday.
- Official acreage estimates shifted during reporting with Cal Fire saying about 400 acres burned in Mexico and 50 acres in the U.S. by midday Tuesday, later reporting roughly 250–300 acres on the U.S. side and at least twice that in Mexico.
- By Wednesday morning the fire had grown to roughly 1,000 acres with containment near 5 percent, and officials issued evacuation warnings for nearby Engineer Springs.
- Firefighters are battling the blaze with ground crews working over rocky, mountainous terrain supported by air tankers and water‑dropping helicopters, and the American Red Cross opened a shelter for people displaced.
- No structural damage or injuries have been reported so far, Cal Fire investigators are probing the cause, and the fire’s binational spread has created operational and reporting challenges for responders.