Kenyan Army killed 21 Al Shabab militants after two of its own soldiers were killed amid an ambush in a town in southern Somalia, a military spokesman reported.
David Obonyo, spokesman for the Kenya Defence Forces, said during the Saturday ambush in Afmadow, an improvised explosive device hit and damaged one of their vehicles.
"Following the incident, 21 Al Shabab militants were killed, 19 AK 47 rifles, three rocket propelled grenades and a pistol were recovered," Obonyo said in a statement late on Saturday.
"Regrettably, KDF suffered two fatalities and five injuries. The injured were evacuated and are receiving medical attention."
The militants, who aim to topple the internationally-backed government, often increased casualty numbers and downplay the number of their own fighters killed.
Meanwhile, Abdiasis Abu Musab, Al Shabab's military operation spokesman, told Reuters on Saturday their militants had killed 12 soldiers.
Al Shabab, is seeking to drive the AU force out of Somalia, and often says its attacks against Kenyan troops are retaliation for AMISOM participation in Somalia.
Hundreds of people have been killed in Al Shabab raids in the past two years. The militant attacks in Kenya have included the attack on the upscale Westgate shopping mall in 2013 and a university in Garissa in 2015.
In 2011, Kenya deployed soldiers into Somalia following attacks in the border region and abductions that threatened the tourism industry in the regions massive economy and wider regional destabilisation. It later joined the AMISOM.