More than 60 people were killed when gunmen attacked police stations and army barracks in western Uganda, the Daily Monitor newspaper reported on Sunday.
Many of the fatalities on Saturday were attackers killed by security forces, an army spokesman was quoted as saying.
The victims also included members of the security forces and civilians.
Police spokesman Fred Enanga said 11 civilians were killed alone in Kasese, one of the three districts targeted by the attackers.
Security forces described the attacks as being motivated by disputes between rival ethnic groups.
There has also been concern over the possible resurgence of a Ugandan Islamist rebel group based in the Democratic Republic of Congo, near whose frontier the attacks occurred.
Forty suspects were arrested, the Daily Monitor said. Police were searching for more. - Sapa-dpa