More than 300 alleged UDA delegates stormed the party's headquarters along Ngong Road on Friday due to the postponement of the Nairobi UDA chairman election.
This election has been cancelled over three times by the National Elections Board, leading the delegates to suspect malice behind the delays.
The delegates can be heard shouting "tunataka uchaguzi kesho" to register their frustrations over the postponement.
The elections had been scheduled for June 22 at the Bomas of Kenya.
“Due to unavoidable circumstances, the County-level election for Nairobi County will not take place as planned,” reads a statement issued by the party’s national elections board chairperson Anthony Mwaura.
Mwaura did not, however, provide reasons for the cancellation of the poll.
“We regret any inconvenience this may cause and appreciate your understanding,” he said.
He noted that further details regarding the rescheduling of this election will be communicated in due course.
This is now the second time in a row the party has postponed the county elections.
The Political Parties Dispute Tribunal halted the elections on June 6 following a complaint lodged by one of the factions.
In a move to find a resolution, President William Ruto directed his Deputy Rigathi Gachagua to lead talks between the two camps and find the way forward.
The highly emotive Nairobi County polls pit two factions allied to Governor Johnson Sakaja and Embakasi North MP James Gakuya.
"On Nairobi where two camps are at loggerheads on the process of elections, Ruto directed Deputy President to lead in negotiations that will lead to a political settlement," a statement by the UDA party said.