Ahmed Mohamed tells The Associated Press that today's blast targeted a military convoy in Galgala. Security forces have been battling Islamic State-linked fighters in the region.
There has been no immediate claim of responsibility for the blast, but the IS-linked extremists have carried out such attacks in the past.
Fighters affiliated with the Islamic State are a relatively new and growing threat in Somalia, where the al- Qaida-linked al-Shabab extremist group has been entrenched for years.
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