According to the media, the blast also injured 53 people.
The Governor of Janaale town in the southeastern Lower Shabelle region, Abdirahman Yusuf Al Adala told media that some people found a huge metal that looked old and tried to use it as a cooking tool, but it exploded after they tried to light it with fire.
The radical Islamist group al-Shabaab based in Somalia has close ties to the international terrorist organization al-Qaeda*. It is waging an armed struggle against the central Government of Somalia and hinders the humanitarian activities of the UN.
Last week al-Shabaab militants killed 54 Ugandan soldiers from the African Union Transition Mission in Somalia (ATMIS), aimed at carrying out peacekeeping operations in the country.
*Terrorist organizations banned in Russia and many other countries