The windscreen of a vehicle belonging to Nation Media Group that was carrying journalists covering the event was also destroyed during the Wednesday afternoon fracas.
Mr Odinga was in Githurai to popularise the Building Bridges Initiative (BBI) as the bill heads to the 47 county assemblies after IEBC on Tuesday approved 1.14 million signatures supporting it.
Traders at the busy Githurai roundabout were forced to close down fearing looting and destruction of their goods in anticipated confrontations between Odinga and Ruto supporters.
Earlier, hundreds of Githurai traders stormed the newly built modern market for allocation after rumours went round that a scheme had been hatched to deny a section of them space.