Police said the suicide bomber strapped with a bomb vest blew up during rehearsals in preparation for the December 20 Police Day celebrations in Somalia.
"A man wearing an explosive vest entered the camp disguised as a policeman, and blew himself up", police officer Mohamed Abdulle said.
The militant Islamist group al-Shabab has said it carried out the attack.
Somali police guard the road leading to the scene of a suicide bomb attack on a police academy in the capital Mogadishu, Somalia Thursday, Dec. 14, 2017.
The bomber walked into the police academy undetected and joined a long line of officers in the rehearsal parade before he detonated the explosives under his sportswear, Hussein said.
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The acting police commissioner said the bombing took place as recruits and officers were preparing for special exercises for the country's upcoming "Police Day".
"He wanted to inflict a maximum damage", said Omar. Somalia has frequent attacks from the Islamic extremist rebels of al-Shabab, who are allied to al-Qaida.
Somalia's militant group Al-Shabab has been blamed for the massive truck bombing in the capital in October that left 512 dead. Only a few attacks since 9/11 have killed more people.
Al-Shabab has converted itself into the deadliest Islamic extremist group in the African continent. It was blamed for the massive lorry bombing that killed 512 people in the capital in October. - making it one of the deadliest attacks since September 11 in NY. - and is now increasingly targeted by the U.S. military after the Trump administration early this year approved more airstrikes and other action against the group.
Al Shabaad have been fighting the United Nations-backed government and its African Union allies.