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(CNN) -- Dozens of African Union soldiers have been killed in two weeks of fierce fighting in Somali capital of Mogadishu, clashes that resulted in significant gains against local and foreign extremists, according to an African Union official familiar with the scale of those losses. The fighting was part of a major offensive by Ugandan and Burundian forces, who are part of the African Union Mission in Somalia (AMISOM), against Al-Shabaab, an al Qaeda-linked extremist group trying to take over the weak transitional federal government and implement a stricter form of Islamic law, or sharia. AMISOM officials said they would not specify exactly how many soldiers have been killed or wounded in the operations until the families and contributing countries were properly notified. Also, they didn't detail Al-Shabaab losses.

We have taken a very important step towards the stabilization of Mogadishu and in pursuit of a day many deemed impossible -- the day when law and order returns to
Mogadishu," Wamunyini said.