Dozens of Mexican National Guard troops killed after cartel leader's death, official says

<img src='https://i.cbc.ca/ais/56b566e8-9b04-481c-b47e-d3ce7c91275a,1771849555049/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C391%2C3757%2C2113%29%3BResize%3D%28620%29' alt='Men in military kit, their faces covered, hold their hands up to say &apos;stop&apos; on the sidewalk of a tree-lined residential street.' width='620' height='349' title='Mexico National Guards remove pedestrians by the general prosecutor&apos;s headquarters in Mexico City yesterday.'/><p></p>