Additional senior Al-Shabaab commanders were also killed or died in combat . Among the slain militant leaders was intelligence chief Tahliil Abdishakur , who was killed in a U.S. drone airstrike in December 2014 ; commander Ibrahim Filey , who was killed during a skirmish with Somali army troops in January 2015 ; chief of external operations and planning for intelligence and security Yusuf Dheeq , who was killed in a U.S. drone airstrike in January 2015 ; head of external operations and mastermind of the Westgate shopping mall attack Aden Garaar , who was killed in a U.S. drone airstrike in March 2015 ; and Gedo province commander Mohamed Musa , who was killed during a skirmish with Somali army troops in March 2015
Westgate shopping mall attack
Westgate shopping mall attack
Operation Indian Ocean