Kenya marked its fight for democracy on Monday, with police blocking main roads in Nairobi ahead of potential protests after last month's demonstrations descended into violent clashes.

Saba Saba Day marks the uprising on July 7, 1990 when Kenyans demanded a return to multi-party democracy after years of autocratic rule by then-president Daniel arap Moi.

This year's event comes as young Kenyans -- frustrated over economic stagnation, corruption and repeated acts of police brutality -- are once again engaging in protests that have degenerated into looting and violence, leaving dozens dead and thousands of businesses destroyed.

Protesters accuse the authorities of paying armed vandals to discredit their movement, while the government has compared the demos to an "attempted coup".