reporter: i did have a chance to speak to amazon, they tell me that typically when they have severe weather alerts come in, they have everyone shelter in place there inside the building, and there has been discussion over potential phone policies, a potential phone ban being in effect. that s not the casement i had a heartbreaking conversation with the mother of one of the victims, 29-year-old clayton coe. she made a phone call around 8:00 when those sirens went off, telling her son clayton who had been working here about one year. hey, be careful. seek shelter if you can. she told me that he responded, yeah, mom, i m going to be okay. let me make sure others can get to shelter, and it was a heartbreaking moment when she came here with her husband later that night and had to hear firsthand from authorities that her son was one of the six who had passed inside that building.