Kenyan troops are engaged in heavy fighting with the al-Shabab militant group on the coast of southern Somalia, both sides have said.
Al-Shabab spokesmen told news agencies that fierce clashes were under way in the port city of Kismayo.
Kenyan military spokesman Col Cyrus Oguna confirmed to the BBC that parts of Kismayo had been captured and the rest was expected to fall soon.
The Kenyan soldiers are part of the AU's Amisom force, which is trying to wrest control of Somalia for the newly elected, UN-backed president Hassan Sheikh Mohamud.
More top news
Jeremy Corbyn faces full rebellion over decision to not step down as leader.
Come October David Cameron will no longer be Prime Minister, but who could replace him as leader of the Conservatives and how is it decided?
"People must be aware at all times that there are wild animals around them and they must make sure that their tents are properly closed."