The Islamist group al Shabaab was behind the attack, said Abdiasis Abu Musab, al Shabaab's spokesman for military operations.
"There was a huge blast presumably caused by a vehicle loaded with explosives", said Ali Abdirahman, a security official, adding that a civilian bus was passing at the time.
A auto bomb attack on a bustling street between the ministry of defence headquarters and a military academy has left at least 15 dead.
"No one can identify the number of casualties (as) bodies of (the) dead (were blown up) into pieces and blood covered the area of the suicide auto bomb attack, vehicles were also destroyed and burned", a journalist at the scene told Xinhua by phone.
Residents gather to view the damage at the scene of a auto bomb attack near Somali Youth League Hotel in Mogadishu February 27, 2016.
Somalia's President replaced his security chiefs on Thursday and called on al Qaeda-linked al Shabaab insurgents to surrender within 60 days in return for education and jobs.
The group aims to expel the peacekeepers and topple Somalia's Western-backed government. Last week a vehicle bomb blast on Wednesday at a Mogadishu restaurant killed at least seven people.
According to a presidential decree, Mohammed appointed a number of retired general to the most important military and security posts.
Mohamed did not mention the new USA directive, but emphasized that Somali troops should take the lead and added in a statement: "We want to pardon the Somali youth who were misled by al Shabaab".
Somalia's security forces are under pressure to improve as they will assume responsibility for defending the country once the 22,000-strong AU force leaves by the end of 2020.
India news presenter learns of husband's death on live TV
She kept on reading the news for another ten minutes and broke down in tears when the camera stopped rolling, the newspaper adds. She has been a news anchor with IBC-24, one of Chhattisgarh's most-viewed channels, for the past nine years.
Fulmer looking forward to starting home opener for Detroit
Through the first two games of the year, the catcher with a.260 career batting average has five hits in his first eight at bats. However, McCann hit a long home run to left-center field for a 2-1 lead after that, and it went downhill from there.
Not so silent night: Dallas emergency siren system hacked
It's a costly proposition, which is why every dollar of taxpayer money must be spent with critical needs such as this in mind. More than 150 emergency sirens were set off in Dallas yesterday sparking terror among citizens about impending doom.