The U.S. surgeon general on Tuesday declared gun violence a public health crisis, driven by the fast-growing number of injuries and deaths involving firearms in the country. The advisory issued by Dr. Vivek Murthy, the nation's top doctor, came as the U.S. grappled with another summer weekend marked by mass shootings that left dozens of people dead or wounded. MORE: https://www.wtsp.com/article/news/nation-world/gun-violence-public-health-emergency-surgeon-general/507-c9475bdd-64c1-4a86-9bfe-2290f3c90946