2 police officers injured at US Capitol
Capitol Police opened fire after a vehicle tried to break through a barrier. source
Vaccine Watch: How far away are COVID-19 booster shots?
ABC News’ Bob Woodruff looks at how Pfizer and Moderna are developing booster shots to target virus variants. SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch More on http://abcnews.go.com/ LIKE ABC News…