Post-election violence, last month, in western Uganda between supporters of rival candidates for national and local elections caused at least 22 civilian deaths and left 10 wounded, police said.
Opposition party Forum for Democratic Change accused the government of escalating the violence.
According to police reports,16 civilians died in the clashes, then six more were killed after the police intervention. Moreover, 10 were injured, including four soldiers, and 149 houses were burned down.
"We have information that criminal gangs are being incited," police said in the statement.
80 people were arrested after some youths attacked members of the security forces with machetes, knives and clubs.
"We caution those misleading the youth into engaging in reckless ... attacks on the security forces and other innocent people to desist," the statement said.
Meanwhile, the US accused the Ugandan government of violating human rights over election violence.
Uganda has persistently violated the rights of its citizens and media in the aftermath of last month's presidential election which saw President Yoweri Museveni retain his hold on power, the United States said.
Uganda's electoral commission declared Museveni, 71 and in power since 1986, the winner of the Feb. 18 election with 60 percent of the vote.
Kizza Besigye, who came in second with 35 percent and has rejected the results as fraudulent, has been under virtual house arrest for weeks. A second challenger, former Prime Minister Amama Mbabazi, has filed an official challenge to the results.
Monitors from the European Union (EU) have criticised Uganda for creating an "intimidating atmosphere" around the vote and have said the electoral body lacked transparency and independence.