>> it's the modern day town square. a gathering place that fulfills our every need, shopping, eating, socializing, a trip to the mall is an escape on weekends, and not just in america, in nairobi, kenya, the upscale and modern westgate mall was the place to unwind at the end of the work week. it was the last place you would expect something like this. >> gunshots, explosions, armed men taking over every floor, methodically shooting anyone in their way. that was the unbelievably brutal scene that played out in front of a shocked world, september 21st, 2013. just after the smoke cleared, dateline travelled to nairobi. we'll take you inside the mall attack with harrowing scenes of how it unfolded and details from