Bolivian Defence Minister Ernesto Justiniano said the updated figures came as emergency workers continued to search the rubble of the barracks in Viacha, about 30km from La Paz. The blast, triggered by what authorities described as "pyrotechnic material," occurred at approximately 14:30 local time on Friday at the site where an artillery regiment was stationed.
Health official Rita Nebraska told local television that between 10 and 15 people are believed to have died, a figure higher than the two confirmed fatalities. She warned of a risk of further explosions and urged the public to stay at least 150 metres from the military base.
Police spokesman Roger Roca told AFP that fireworks had been stored at the barracks. The cause of the detonation remains under investigation.
President Rodrigo Paz expressed his "deepest solidarity" with the families of the victims and wrote on social media that a "thorough, technical and transparent investigation" would be conducted.
Police said dozens of homes were damaged in the blast, mainly shattered windows. Local authorities in Viacha have declared three days of mourning.