The terrorist group, which has been waging a deadly insurgency against Somalia's fragile central government for more than a decade, claimed responsibility for the assault.
The move paves the way for a presidential vote in Somalia after more than a year of political deadlock.
A slow-burning political crisis in Somalia deepens as the Prime Minister and the President wrangle over the expulsion of the African Union envoy to the country.
Two attackers and at least two security guards, thought to be Kenyan nationals, and a Somali policeman were killed in the incident, while four others were wounded.
After countless delays and missed deadlines, the lower house elections in Somalia were due to be completed on March 15.
At least six people were killed and several others injured in the attack in the country's coastal region bordering Somalia.
President Mohamed Abdullahi Mohamed and PM Mohamed Hussein Roble accuse each other of holding up ongoing parliamentary elections, as US calls for a credible conclusion to the polls.
Two Somali state media journalists were wounded, one of them seriously, in the blast that hit their vehicle in the capital Mogadishu.
Civilians gunned down by AMISOM forces were under fire from al-Shabaab terrorists.
At least eight people were killed in the blast, which was claimed by Al Qaeda affiliated Al Shabab terror group.
Somalia's PM Mohamed Hussein Roble and regional state presidents sign agreement to allow elections within 60 days after a deadlock that had held them up for months.
Al Shabab attacker kills six police officers including commander of Waberi police district in capital Mogadishu, officials say.
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