Video: Gunmen open fire in Nairobi shopping mall Gunmen threw grenades and opened fire on at Nairobi's most upmarket mall, witnesses and police said. The volleys of gunfire moved outside the mall after police arrived nearly half an hour after the attacks began and engaged the gunmen. Large pockets of people trapped in the mall came streaming out over the course of an hour. At least half a dozen were bloodied and were grabbed by emergency service personnel, many clutched small children. Nairobi police chief Benson Kibue said the gunmen had besieged the building and officers were on the ground engaging the attackers. The Westgate Mall is situated in Nairobi's affluent Westlands area and is frequented by expatriates and rich Kenyans.