walton: just an opportunity to walk around, kill a couple hours. and i knew that we'd go home and have naps and everybody'd be happy. kate snow: the waltons chose to move to kenya two years earlier from texas. for katherine and phillip, it was like going home. they were both children of missionaries and grew up in countries in west africa. they met in boarding school in africa, married in the states, and started raising their family. at the time of the attack, blaise was 14 years old, ian 10, portia four, gigi two, and petra, the baby just 13 months old, was born in kenya. their morning at the mall unfolded just as any family's might. they had lunch together in the third floor food court. after lunch, the boys decided to race down to the first floor to a big department store, sort of like a super wal-mart, called nakumatt. mom and the three young girls were still finishing up lunch, so they lagged behind. as they were walking through the mall to catch up with the boys, with the baby in a sling and the two toddlers holding mom's hands, it happened-- an explosion. so the first thing that tells you something's wrong is a huge bang? yeah. yeah. kate snow: coming from where? it was the main entrance, so it was off to my right and behind me. i remember turning around and looking at it, and just seeing people screaming and running. kate snow: in those first seconds, katherine was unsure what was happening. she thought it sounded like broken glass or something falling, but she immediately grasped that she and her girls were in danger. the chaos confused another mother not far from katherine on the main floor. faith wambua was in the mall with her two children, nine-year-old daughter sy and 21-month-old son ty. the agricultural researcher was shopping for an anniversary present for her husband. she was in a flower shop when she first heard thise. it was so loud that i actually thought that it must have been an earthquake and the building was collapsing. so that's the point when i just told my kids to lie down. of course, i'm scanning the area wondering where are we going to go. kate snow: scenes captured on security cameras in the mall show how quickly the attack began. you can see machine gun bullets flashing down the main concourse as shoppers frantically scramble and dive to the floor. and then i saw tracer rounds starting to hit the shops that were straight ahead. kate snow: katherine's first thought, protect her kids. it was, you know, just instinct to grab the girls and run. but we must not have gone very far and a kenyan woman came, scooped up portia, and um, and we both ran right behind this display table, display cabinet. kate snow: her girls, and the kenyan woman took cover the only place they could. here they are crouching under a flimsy temporary display table. petra was crying, because i was laying on her, and it was loud. it was very loud, very chaotic. what was happening around you? what are you hearing? everybody was scrambling. the shooting was like coming from all directions. kate snow: katherine knew her boys had been headed toward that department store, the nakumatt. amid all the noise and commotion, she managed to call them and yell out a quick warning. i said, don't come out of nakumatt. they're shooting. go, run, hide. do not come out. kate snow: katherine knew the situation was dangerous, extremely dangerous, but at least she had some cover. faith wambua and her kids were also trapped on the ground floor but cowering out in the open, exposed to the gunmen stalking new victims. i'm telling the kids to lie down. then now there's this continuous loud sounds and that's when i knew they were shooting. then i thought, "uh oh, wrong choice of hiding place." i remember even my daughter at one point asked me, "mama, was this the best place we could hide?" kate snow: the assault continued. you're not hearing just one gunman. you're hearing multiple- - all over. it sounded like it was all over. of course, in the building it was just echoing and reverberating. so you could actually look up and see other floors? where i was laying, i could see across and up the different levels. you know, it was just chaos. what's the smell like? the whole mall was cloudy and just smoke everywhere. gunpowder, burning smell. did any of them come anywhere near you? i saw two of them that walked from the main entrance in front of the line of stores that were directly in front of us and-- hold on. what did you see? i mean you saw their go by? no, i saw them. i saw two whole men. you know, they were 50 yards, 30 yards away, i don't know. kate snow: what did they look like? they had tan and gray clothing, and they were carrying very, very large weapons, very large guns. kate snow: hearing the gunfire and screams echoing through the mall, both katherine and faith could tell the gunmen were spreading out, killing people as they went along. two mothers trapped with young children worried they'd be next. and a growing fear seized katherine. her boys were no longer answering their phone. where were they? craig melvin: coming up, the terrifying uncertainty for those inside the mall and loved ones outside. i get woken by a phone call. your wife and sons are in there and they're separated. craig melvin: soon a friend of katherine's who's been texting with her would go from worried to frantic. when she sent that, my heart just sank. craig melvin: when dateline continues. it's mesmerizing. cleaning that greasy mess with dawn platinum... and not even scrubbing. —well, fluff my feathers. — [giggle] it cuts through the slimy stuff better than their old dish soap, removing 99% of grease. that's why only dawn is trusted to save wildlife. that's why new to the big city?y dawn yeah. -i'm mara. -hi. apparently progressive lets homeowners and renters bundle with their auto policy. 24/7 protection for all of my...things. 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[gunshots] kate snow: armed men stormed into the westgate mall in nairobi, kenya, firing round after fatal round. katherine walton hunkered down near where the shooting had started, crouched in a small kiosk with a stranger and her three young daughters. she was desperately worried about her sons who were somewhere out there, but she had to focus on keeping her daughters quiet so they wouldn't attract attention. are you hiding from gunmen? yeah. we were laying down on the ground trying to hide from them so that they couldn't see us. portia kept her fingers in her ears. gigi lay there and she said, "mom, i want my blanket, and my mouse, and my flashlight." she sleeps with those three things every night. she said she wanted her brothers. and i told her that we'd see them later. kate snow: katherine could only hope that was true. half a world away, a phone rang in a hotel in north carolina. katherine's husband philip, a tech entrepreneur, had gone back to the us for business meetings, leaving his wife alone in nairobi with their five kids. i get woken up about 6 am by a phone call from paul weaver, who's our dear fa