President Yoweri Museveni has said those who killed Abiriga are stupid.
Speaking to family members and neigbours in Kawanda, Wakiso district on Saturday morning, the President re-echoed security's commitment to get the killers.
The President, who spoke in swahili, highlighted on the need for vigilance.
The President is later expected to preside over the Heroes' Day celebrations at Birembo in Kakumiro district.
Ethiopian Prime Minister is in the country to take part in the celebrations.