PORTO VELHO, Brazil (AP) — Under increasing international pressure to contain fires sweeping parts of the Amazon, Brazilian President Jair Bolsonaro on Friday authorized use of the military to battle the massive blazes.

Brazilian forces will deploy starting Saturday to border areas, indigenous territories and other affected regions in the Amazon to assist in putting out fires for a month, according to a presidential decree.

The armed forces will collaborate with public security and environmental protection agencies, the decree says. Bolsonaro's office confirmed that he had signed it.

Bolsonaro...