Omar Nabhan

Yahya Ahmed Osman (1998–21 September 2013), also known by his nom de guerre Omar Nabhan, was a Somali mass murderer and al-Shabaab militant who was one of four perpetrators of the 2013 Westgate shopping mall attack that killed 67 people and injured a further 173. He was killed during the attack.

Life He was born in 1998. Another militant stated that Nabhan trained and graduated from an Al-Shabaab training camp in the town of Balad in 2009.

Attack On 21 September 2013, Nabhan and three other heavily armed men drove to the front entrance of the Westgate shopping mall in Nairobi, Kenya. The four men split into pairs, and Nabhan went with Hassan Abdi Dhuhulow into the mall, where they immediately began to shoot at shoppers in their vicinity. Dhuhulow entered a restaurant where three died, while Nabhan entered a children's shoe store adjacent to it. He fired six bullets into a man, killing him. All four men were later killed.