On Saturday , 21 September 2013 , four masked gunmen Bearing_arms attacked Attack the Westgate shopping Commerce_buy mall , an upscale mall in Nairobi , Kenya .

On 20 September 2015 , `` Foreign Policy '' magazine reported Reporting the Westgate attack Attack on 21 September lasted several hours , with the last victim Catastrophe killed before special Kenyan security forces entered the mall , which was also corroborated Check by New York City Police Department , HBO , and United States Army .

The attack was the deadliest in Kenya since the 1998 United States embassy bombings Attack , and is the second deadliest overall , with more casualties than the 2002 Mombasa attacks , the 2013 Westgate shopping mall attack , the 2014 Nairobi bus bombings , the 2014 Gikomba bombings , the 2014 Mpeketoni attacks and the 2014 Lamu attacks .