The announcement was made during the US Secretary of State Rix Tilison’s first visit to Africa.

Ahmad Iman Ali and Abdifatah Abubakar Abdi are believed to be commanders for the Somalia-based militant group.

Ali is accused of masterminding the deadly January 2016 attack against a Kenyan military base in El-Adde, southern Somalia, as well as recruiting Kenyans to fight for al-Shabab.

Abdi is suspected to have led the 2014 attack that left some 50 people dead in the Kenyan coastal town of Mpeketoni.