Nine peacekeepers were killed on Thursday in a suicide attack by Islamist rebels on the headquarters of the African Union force in the Somali capital Mogadishu, the Ugandan military told AFP.
"Among those who died is the AMISOM deputy commander Major General Juvenile Niyonguruza," who was about to complete his tour of duty in Somalia, Ugandan army spokesman Lieutenant Colonel Felix Kulayigye said.
"Nine soldiers have died but we are yet to know how many are Burundians and how many are Ugandans," Kulayigye added.
The African Union force, known as AMISOM, numbers around 5,000 troops from the two countries.
The AMISOM commander, Ugandan General Nathan Mugisha, was also hurt in the attack, but the spokesman described his injuries as minor.
The attack was claimed by the hardline Islamist Shebab, which is fighting to overthrow a transitional government led by President Sharif Sheikh Ahmed.