NAIROBI, Jan 17 (Reuters) - Riot police fired teargas at hundreds of protesters blocking a road near Nairobi's Mathare slum as a second day of demonstrations against President Mwai Kibaki's disputed election began on Thursday, witnesses said.

Gunshots were also heard during the morning from a slum area of the western opposition stronghold town of Kisumu, which saw the worst violence on Wednesday, the first of three days of nationwide demonstrations called by the opposition. (Reporting by Antony Njuguna in Nairobi, Guled Mohamed in Kisumu; Writing by Andrew Cawthorne)

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