Fighting has broken out in the Somali capital, Mogadishu, between different sections of the security forces.
Reports said heavy weapons were used and mortar rounds were fired near the presidential palace.
Some of the military units support President Mohamed Abdullahi Mohamed while others are opposed to him.
Last week, Mr Mohamed – known as Farmajo – controversially approved a two-year extension of his term in office, as his mandate officially ended in February.
The move was strongly criticized by the international community including the UN and the African Union.
Reports from Mogadishu yesterday said what started as localized clashes spread to other parts of the city including central areas. END