DA members arrested ahead of Sona
Shaun August and Marius Redelinghuys were among those who were arrested.
Adderley Street is part of the route President Jacob Zuma would take to make his speech. It's an area which has been turned into what the police have termed a "sterile zone" with lots of bars and railings set up along the pavement blocking off exits to the road itself.
- James Styan (@jamesstyan) February 12, 2015
Speaking to Eyewitness News from the back of a police van Redelinghuys said he still did not know why he had been detained.
"I was arrested after I had been assigned as one of the DA's members who had gathered along Adderley Street and who were being forcefully removed by the riot police. I have attempted to enquire with the police why they were being removed."
In a police lock up van for asking why @DA_News members were being shoved away from Adderley Street. Picture: Marius Redelinghuys via Twitter.
Phumzile van Damme has described the use of force by police as extreme.
- Marius Redelinghuys (@MariusMR) February 12, 2015
Reports also say a water cannon was used to disperse supporters.