A Washington gun store clerk says he refused to sell a handgun to Arcan Cetin just hours before the deadly shooting at Cascade Mall.
'We are absolutely concerned,' a Homeland Security official said. 'The concern is the ability to cause confusion and chaos.'
Jacob Hall, a student at Townville Elementary School, was still listed in critical condition Thursday afternoon.
'It was for a couple seconds, but it felt like an eternity,' a passenger said. 'I saw a woman pinned under the concrete. A lot of people were bleeding. One guy was crying.'
Vice-Chairman Bella Dinh-Zarr also explained some of the early challenges investigators face in determining the cause of Thursday's train accident in New Jersey.