AMISOM Command says troops in all sectors have started military operations against Somali Islamist s blamed for terror and oppression in Somalia.
5 Towns in north western Somalia have already been taken by Ethiopian troops.
Ugandan troops in Mogadishu have launched a new offensive outside the districts using tanks and mortars.
In the South, Kenya defense forces is leading an onslaught on towns currently held by the militants.
Kenya has also launched air strikes on bases and positions held by the militants.
Kenya air force is the only AMISOM component launching airstrikes as battle strategy.
AMISOM is a component of the United Nations, and is mandated to keep peace in Somalia.
A statement from United Nations confirm a major offensive on Al-Shabaab militants is underway in Somalia.