Witnesses said the Shebab took over the camp, looting weapons stores and loading corpses onto trucks.
The attack comes as Somali forces backed by troops from the African Union have launched an offensive, dubbed Operation Jubba Corridor, to push al-Shabab out of its last strongholds.
Barack Obama will also spend private time with family members but will not travel to the village that is most closely associated with the family name, said White House.
The Somali Islamic extremist group al-Shabab, which has vowed to step up attacks during the Muslim holy month of Ramadan, claimed responsibility for the attacks.
The bomb was apparently planted under a seat and was detonated by remote control, said police official Yusuf Ali.
Al Shabaab’s military operations spokesman Sheikh Abdiasis Abu confirmed that the group was behind the attack.
Kenyan streets were filled with public anger over late response from police during University attack which left 148 dead.
The threat came in the final minutes of a more than hourlong video in which the extremists also warned Kenya.
Mogadishu’s deputy mayor and a legislator were killed in the attack, a lawmaker said.
Citizen Television said the 36 workers were killed when suspected al Shabaab militants from Somalia attacked the quarry.
The UNSC has voted unanimously to authorise international ships to keep patrolling sea lanes off Somalia.
The court added that the issue of coordination at international level had to be left to the wisdom of experts in the government.
Our demand to demilitarise the Strip is not only for Israelis; it’s also for you, Fathi. We prefer happy neighbours to suffering neighbours.
The Islamic militant group al-Shabab claimed responsibility through an announcement on its radio station.
At least seven people were killed, including six attackers and one soldier who tried to stopped a suicide bomber from entering the building.