Police officer Mohamed Hussein said 10 people were also injured in Monday's blast in an explosives-laden car parked near a mall close to Mogadishu's local government offices, Al Jazeera reported.
"Several dead people were removed from a wrecked building at the blast scene. So far death toll is 11 civilians and 10 others injured," Hussein told Reuters news agency.
Another security official, Ahmed Moalin Ali said some of the victims died in a building that collapsed as a result of the blast in Hamarweyne market.
While there was no immediate claim of responsibility, the al-Shabab armed group has regularly carried out such attacks in the past.
In a separate incident, local security officials said the armed group killed the Maltese manager of Bossasso port in Somalia's semi-autonomous Puntland state on Monday.
