Capt Mohamed Hussein says many of the victims were killed at point-blank range after the attackers hunted them down.
Police say nearly 40 people were wounded in the assault that began when a car bomb exploded outside the Pizza House restaurant in Mogadishu.
Security forces ended the siege this morning after the extremist snipers fired on them. Hussein says all five attackers were killed.
Fighting continued through the night as Somalia's al- Shabab Islamic extremists fought off heavily armed soldiers in a bloody siege at a popular Mogadishu restaurant.
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Senior Somali police office Capt. Mohamed Hussein said at dawn today that at least one attacker was firing on troops from inside the restaurant.
The roofs were blown off the Pizza House restaurant and nearby buildings from the powerful blasts.
High casualties are feared in the attack on the busy restaurant. Police said the bodies of five girls thought to have been killed by militants were found in the restaurant.