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Armed policemen have laid checkpoints on roads leading to State House in the capital, Nairobi, amid fears of planned opposition protests.
Motorists are being stopped and searched at various points on the roads.
It follows the lapse of a 14-day ultimatum issued by the opposition for the government to address concerns about the high cost of living.
Opposition leader Raila Odinga has been leading a series of anti-government rallies countrywide.