A man rammed a car into a security barrier just outside the US Capitol building before jumping out with a knife.
One officer was killed and the attacker, identified as 25-year-old Noah Greene, was shot dead.
While not thought to be "terrorism-related", the incident has shaken Washington, which is still on edge since the Capitol riots.
Al Jazeera's Patty Culhane reports from Washington, DC.
- Subscribe to our channel: http://aje.io/AJSubscribe
- Follow us on Twitter: https://twitter.com/AJEnglish
- Find us on Facebook: https://www.facebook.com/aljazeera
- Check our website: https://www.aljazeera.com/
#AlJazeeraEnglish #UnitedStates #PoliceOfficers