Capt Farah Osman, a Somali police officer at the scene, confirmed to CNN that the explosion tore through a Mogadishu mall in the capital's business district, Hamarweyne.
At least 12 people were killed and 15 others injured when a vehicle bomb exploded today in Hamar Weyne downtown district of this capital, police sources reported. "So far death toll is 11 civilians and 10 others injured", Hussein told Reuters news agency.
"The bombing follows a U.S. airstrike which killed 13 suspected Al-Shabaab fighters outside Mogadishu yesterday", said The New Arab's James Brownsell.
The blast destroyed several buildings nearby, Abdulle added.
"The US has now announced 10 airstrikes on Al-Shabaab already this year".
The bombing on Monday came amid major operations staged by Somali national forces against the al-Qaida-affiliated group in central and southern Somalia.
The group is trying to remove the Western-backed central government and establish its own rule based on its strict interpretation of sharia law.
Shortly afterwards, a powerful explosion from a auto bomb rocked Hamarweyne market in Mogadishu, the capital, killing nine people.
In a statement issued on Saturday, Africom said "US Africa Command now assesses this airstrike killed thirteen militants".
Its latest assault in Kenya, a suicide and gun attack at an office and hotel complex in the capital Nairobi last month, killed 21 people. "At this time, it was assessed no civilians were injured or killed in this airstrike".