The National Intelligence and Security Agency (NISA) said in a tweet on Monday.
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NISA added it would investigate the assault with help from a foreign intelligence agency.
No one has claimed responsibility for the bombing at the busy Ex-Control checkpoint in the northwest of Mogadishu.
The most deadly attack blamed on al Shabaab was in 2017 when a truck bomb exploded next to a fuel tanker in Mogadishu, killing almost 600.
UN experts say that Al-Shabab are now manufacturing home-made explosives, expanding their revenue sources and infiltrating government institutions.
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UN Secretary-General, Antonio Guterres has urged the country to tackle violent extremism, terrorism, armed conflict, political instability and corruption.
AFP NEWS