"No one expected them to carry out attacks just two weeks to the day they launched Somalia's deadliest attack, in which more than 358 people were killed", Adow added.
The Somali government blamed the October 14 blast on al-Shabab, but no group has claimed responsibility.
Police officer Major Abdullahi Aden told Reuters the auto bomb said: 'They are fighting inside.
President of Somalia, Mohamed Abdullahi Mohammed, escaped death on Saturday, after the al-Shabab militant group attacked Hotel Naasa-Hablood, where he was scheduled to hold a meeting.
Among the dead were a mother and three children, including a baby, all shot in the head, Capt Hussein said.
According to Somali national news agency (SONNA), former MP Abdinasir Garane and former police commissioner of Daynile district Mohamed Yusuf were among the dead.
Footage from the scene showed twisted vehicles and nearby buildings with only walls left standing.
The first explosion was reportedly caused by a vehicle bomb.
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"Security forces have entered a small portion of the hotel building ... the exchange of gunfire is hellish", he said.
And the Nasa-Hablod hotel was targeted just past year, when al-Shabaab gunmen stormed the building, killing at least 14 people and injuring another 25.
In a written statement, the ministry said on its website: "We strongly condemn this heinous terrorist attack".
Police Colonel Mohamed Abdullahi says the bomber stopped outside the heavily fortified hotel and pretended to fix the vehicle before finally turning it around and detonating.
Witnesses in some previous attacks have said al Shabab fighters disguised themselves by wearing military uniforms.
Terror group Al-Shabab, which has links to al-Qaeda, often targets high profile areas in the city.
United States military officials and others in recent months have expressed concern that Somali forces are not yet ready.
The US military also has stepped up military efforts against al-Shabab this year in Somalia, carrying out almost 20 drone strikes.