ADDIS ABABA, Ethiopia (AP) — The Ethiopian National Defense Force is confirming an ambush by al-Shabab extremists on an Ethiopian peacekeeping convoy in neighboring Somalia and says Ethiopian forces are preparing a "massive offensive" in response.

A statement on Saturday rejects reports and an al-Shabab claim that several Ethiopian troops were killed. It does not give further details on casualties.

The ambush was reported as the al-Qaida-linked al-Shabab claimed responsibility for the deadly hotel assault in Nairobi and deadly attacks on forces inside Somalia. The statement does not say exactly when the ambush occurred.

Ethiopia contributes troops to a multinational African Union peacekeeping mission.

The statement says the ambush occurred when the Ethiopian convoy was traveling Burhakaba to Baidoa in Somalia's southwest.