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
The live stage version of Peter Kay's Phoenix Nights has reportedly been cancelled after actor Ted Robbins collapsed on opening night.
The much-loved local character, who had lived on the city's streets for decades, died in hospital this week after falling ill.
Man City remain five points behind Chelsea in the Premier League title race after a 1-1 draw at Stamford Bridge