The al-Qaida-linked group claimed responsibility for today morning attack on the base in Af Urur, near the commercial hub of Bossaso.
The SITE Intelligence Group, which monitors extremist groups, says al-Shabab issued the claim via its Shahada News Agency.
The extremist group also said it seized a large amount of weapons and ammunition and more than a dozen military vehicles.
Puntland in northern Somalia also faces a growing threat from Islamic State group-linked fighters who have split from al-Shabab.
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