The bodies of at least four Kenyan soldiers slain by Somali Islamic extremists have arrived in the Kenyan capital.

The victims' caskets, draped in Kenyan national flags, were received late Monday at Nairobi's Wilson Airport by defense officials who witnessed a military honor guard.

An inter-faith prayer service was performed on the runway.

Kenyan officials have not said how many soldiers were killed when Islamic extremist fighters attacked a base for African Union peacekeepers in southwestern Somalia on Friday.

Al-Shabab, which claimed responsibility for the attack, claims about 100 Kenyans were killed in the attack.

The armed group, which has ties with al-Qaida, opposes Kenya's military involvement in Somalia and describes Kenyan peacekeepers as invaders.