Tweeps took to social media asking for help.
Kîmemia Mûkabi send out and SOS saying: "Gunshots and explosions at 14 Riverside drive. @PoliceKE @DCI_Kenya. Someone help us!!Ma3Route."
He later posted a photo of him hiding in the office.
While @SookieMurage asked: "WHY IS EVERYONE RUNNING ON WAIYAKI WAY."
@Enjiiri added, "Theres been an explosion in 14 riverside. Gunmen shooting the place around. We need help!"
@AdellaMondi cried, "Can anybody tell me what's happening...we are all scared stiff in the office in riverside."
@_Mutui_ tweeted: "People running to their safety along Waiyaki Way."
A passenger who heard the explosion said, "Boombing and gunshots around 14th Riverside be careful. Westlands Am at Delta Riverside almost running."
while @kiburi_kiburi said there was "continuous gunshots, more likely AK47. 14th Riverside, watching from Rhapta Road."
