Armed Zimbabwean soldiers sit on top of a military tank in Harare, Zimbabwe Wednesday, Nov. 15, 2017. At least three explosions were heard in Zimbabwe's capital early Wednesday and military vehicles were seen in the streets after the army commander threatened to "step in" to calm political tensions over 93-year-old President Robert Mugabe's possible successor. The ruling party accused the commander of "treasonable conduct." (AP Photo/Tsvangirayi Mukwazhi)