A suicide car bomber blew himself up near a moving convoy of Somalia's US-trained elite forces in Mogadishu, killing at least four people, ABC News quoted a Somali police officer as saying on Sunday.
Somali militant group al-Shabab claimed responsibility for the attack.
The attack on the airport road in the capital killed mostly pedestrians walking along the road, said Capt. Mohamed Hussein.
Mohamed Yusuf, the spokesman of Somalia's National Security Ministry, said the government had information about the attack, and the car bomb was detonated while the attacker was being pursued.