At least 11 people including six African Union (AU) peacekeepers have been killed after two large car bombs exploded in the AU's headquarters in Mogadishu, the Somali capital.
Seven more people were also killed and 18 wounded in gun battles that broke out after the blasts on Thursday, witnesses said.
Sheikh Ali Mohamud Rage, an spokesman for rebel group al-Shabab, claimed responsibility for the attacks saying they were to avenge the death of Salah Ali Saleh Nabhan, a Kenyan-born al Qaeda suspect, who was killed in southern Somalia on Monday during a raid by US special forces.
"We have got our revenge for our brother Nabhan. Two suicide car bombs targeting the AU base, praise Allah," Rage said.
"It took place at noon on the 27th of Ramadan, the best blessing. We knew the infidel government and AU troops planned to attack us after the holy month. This is a message to them."