Machines. During the chaos, a second attacker went upstairs and blew himself up. The third attacker waited outside. Detonating his explosives as people ran out of that airport in a panic. 42 people killed. More than 230 wounded. There are no known american casualties. Some of the victims have yet to be identified. Steve handelsman is at Reagan National as security measures at home are revealed. Steve . Reporter thanks. Officials at airports across america are nervous. They know terrorists are copy cats. Officials are worried. They know terrorists are copy cats. That after the isisinspired attack on belgiums airport the Brussels Airport in march came istanbul. Airports are perfect targets. Security looks tighter at some u. S. Terminals but defending any airport is a tough task. They are full of people. 62 million a year in and out of istanbuls airport that reopened today. 101 million at atlantas hartsfield airport, the busiest in the world. That alone looks tempting to isis and its foll