Capt. Prosper Hakizimana says the man was dressed in a Somali government military uniform when he attempted to enter the base Monday night. Hakizimana says the man was shot at by AU forces and immediately blew up.
Hakizimana said casualties were unknown.
Al Qaeda-linked Islamists are battling the weak U.N.-backed government for control of the capital of Mogadishu. Around 9,000 AU troops are stationed in the city to prevent the government from being overrun by militants.