A police van ran over three NASA protesters during demonstrations in the Nairobi CBD on Monday.
It is said trouble began on Kenyatta Avenue after police shot one on grounds he tried to steal from the GK van.
As the protesters charged to question the incident, the driver of the van tried to speed off, running over the three.
This prompted the crowd to run charge towards the police vehicle.
The protesters earlier gathered at Uhuru Park with woman representatives Esther Passaris (Nairobi) and Gladys Wanga (Homa Bay).
As they marched towards Anniversary towers through Kenyatta Avenue, gun shots were heard near GPO.