Twin car bomb explosions targeting Somalia's Education Ministry building in the capital Mogadishu on Saturday killed at least 100 people and injured more than 300 others, Somali President Hassan Sheikh Mohamud said on Sunday.

The fatalities are likely to rise, Mohamud told media after visiting the bombing site on early Sunday.

Several government offices, hotels and restaurants are situated near the bombing site.

An unspecified number of people, including journalists and police officers were among the casualties, Sadiq Dudishe, spokesperson of the Somali Police Force, said earlier.

The Al Qaeda-linked Al-Shabab extremist group, which often targets the capital and controls large parts of the country, claimed responsibility.

Somali Prime Minister Hamza Abdi Barre, while condemning the attack, said such action by Al-Shabab won't stop the government's commitment to eradicating terrorism in any form.

The African Union Transition Mission in Somalia in a statement called for sustained military operations against the insurgents, so as to suppress surging terror attacks in the country.

The UN Assistance Mission in Somalia tweeted it "wishes a speedy recovery for those injured, and stands resolutely with all Somalis against terrorism."

The blasts came as the Somali president and leaders of the federal member states, including security officials, were meeting to discuss ongoing offensive operations against al-Shabab.