Kenyan authorities say dozens of people have died in the attack. Somali militant group al-Shabab has claimed responsibility.
Somali President Hassan Sheikh Mohamud says reports that some of the attackers may have been Somalis who lived in the United States illustrate the global nature of al-Shabab.
Mohamud said after a Monday speech at Ohio State University in Columbus that he has spoken with the president of Kenya and plans to visit the country.
Mohamud says his government is committed to uprooting al-Shabab. He says maintaining security is his top priority as Somalia rebuilds after decades of civil war and terrorist threats.
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