Four militants of Somalia based Al-Shabaab entered the Westgate Mall on September 21, 2013 in the nation's capital of Nairobi and fired on shoppers, The Daily Mail reported.
The mall was badly damaged in the four-day siege by the militants.
Exactly 22 months ago we had one of the saddest days in Kenyan history," Nairobi governor Evans Kidero quoted as saying.
It was once one of the Kenyan capital's most prestigious shopping locations.
Since Westgate, the al-Shebab have continued to launch attacks in Kenya. In April, the militants massacred 148 people in Kenya's northeastern Garissa University.
Read More: Al Shabaab militants kill 14 people in Kenya
The group has carried out many attacks in Somalia and in neighbouring countries, including Kenya, whose armies are part of the African Union peacekeeping mission known as AMISOM.
Al-Shabab controlled much of Mogadishu during the years 2007 to 2011, but was pushed out of Somalia's capital and other major cities by the AU forces.