A Somali police officer says a suicide bomber has detonated an explosives-laden car at a police station in the capital and killed at least five people.

Officer Mohamed Abdi says it was a powerful explosion that ripped its victims apart.

No group claimed has responsibility but the blame usually falls on Islamist insurgent groups who use suicide bombers and explosions as means to defeat a fragile government supported by 8,000 African peacekeepers.

Somalia's capital, Mogadishu, has been the epicenter of the country's two decades of violence.