A Walmart worker sent a mass email urging thousands of associates to strike over gun sales

(CNN)A Walmart corporate worker urged co-workers to stage a sick-out in a mass email that he hopes will persuade the company to stop selling guns. Walmart is one of the largest retailers of guns and ammunition in the world, and its stores were the scene of two deadly shootings last week. Two employees were killed in a Mississippi store on July 30, and a white supremacist killed at least 22 people on Saturday in El Paso.