nairobi kenyan police fire teargas disperse crowd protest sunday overnight murder four people slum capital nairobi part city grip tension since friday least five people kill violence involve police opposition supporters accompany leader raila odinga trip abroad japheth koome police commander city say investigations start four body find mathare area four slum sunday morning go find body injuries tell news conference describe murder criminal act rather ethnic-driven violence violence take place day supreme court rule two case seek nullify re-election president uhuru kenyatta repeat election hold last month odinga successfully petition kenyatta initial victory aug. vote subsequently boycott repeat poll visit scene murder sunday accuse government behind kill act ones already lose want hold onto power force remove use power people tell crowd supporters police fire teargas use water cannon disperse protesters good part morning calm restore area afternoon broadcast industry regulator communications authority kenya say ban live broadcast political rally main tv station show hours live footage chaos greet odinga return source authority tell reuters sunday ban put place help manage tension country kenyan police fire teargas break slum protest four murder