Updated

Somalia's police say a car bomb explosion in the capital has killed at least five people.

Capt. Mohamed Hussein said the blast late Thursday was by a car parked outside a restaurant in Mogadishu's Hamarweyne district and killed mostly civilians.

The explosion shattered a period of calm in this seaside city which has a large security presence following a series of attacks by the Islamic extremist rebels of al-Shabab, who are linked to Al-Qaida and fighting the Somali government and African Union forces in the country.

There was no immediate claim of responsibility for the blast. However al-Shabab often carries out such attacks.

Despite being ousted from large parts of the south and central Somalia, the insurgents continue deadly attacks across the country.