Ugandan activists have vowed to press ahead with a North African solidarity protest due to be held on Friday, after postponing the event last week when police issued an earlier ban on a rally at a central Kampala venue.
"If (they) come by force then we will use the minimum force to disperse them," said Andrew Kiweesi, Kampala's metropolitan police commander.
Several recent opposition rallies over rising food and fuel prices have been broken up by police using tear gas and water cannons.
Protests over rising living costs in April led to a brutal clampdown by security forces that left at least 10 people dead across the country.
Kiweesi said that the police "strongly object" to the venue chosen by the opposition as it is close to the city's busy business district.
They have suggested another venue for the demonstration in the city.