Authorities provide an update on the mass shooting at a Smithsburg, Maryland manufacturing facility, that left three people dead and one person hurt. STAY CONNECTED: INSTAGRAM » https://www.instagram.com/fox5dc TWITTER » https://twitter.com/fox5dc FACEBOOK » https://www.facebook.com/fox5dc On the go? Stay in the know! Keep connected to DC, Maryland and Virginia news and weather by downloading FOX 5's mobile apps, and make sure to allow notifications to receive alerts: https://www.fox5dc.com/apps