Somalia's al-Shabab fighters have said they will attack the capitals of Burundi and Uganda in revenge for rocket attacks by peacekeepers from the two countries.
The threat follows the killing on Thursday of at least 30 people in Mogadishu, the capital, by Amisom, the African Union's peacekeeping force to which Uganda and Burundi contribute troops.
Speaking late on Thursday, Sheikh Ali Mohamed Hussein, a senior al-Shabab commander, said: "We shall make their people cry. We'll attack Bujumbura and Kampala ... We will move our fighting to those two cities and we shall destroy them."
Burundi and Uganda have each 2,500 peacekeepers for Amisom.
Witnesses said Amisom fired at least 35 rockets into the capital's Bakara market area on Thursday after al-Shabab fighters there launched mortar shells at the aircraft of Sharif Sheikh Ahmed, the Somali president, as he left the airport for a summit in Uganda.