Police have arrested Embakasi East Member of Parliament Babu Owino, Ruaraka MP Tom Kajwang and former Starehe parliamentary aspirant Steve Mbogo.
The three opposition allied politicians were apprehended under unclear circumstances on Ngong Road while heading to Kibera for a rally convened by the National Super Alliance (NASA).
They were taken to Kilimani Police Station.
Reports indicated that the three were arrested for contravening a police order, which prohibited Opposition leaders from holding a public rally in Nairobi.
Police had earlier cancelled and announced that Kamukunji grounds in Kibera had been sealed off but the politicians vowed to go ahead with their rally.