crosby, texas, 20 miles northeast of houston. this is a chemical plant, arkema plant. our correspondent matt finn is in houston. joins us now by a phone. we are looking, math, at these huge claims, these plumes of smoke. authorities say they expected it to happen. it looks like it s happening again, one of these containers. well, bret, one of the most concerning things yesterday we were unable to establish how any irritants might be. we were getting so much conflicting information first from the sheriff who said, his guys are in the radius, it s mike s breathing and smoke from a campfire. a short while later, an executive from this chemical plant, arkema, got in front of the camera and said if you re in the radius, you need to close your windows. later in the evening, homeland security advisor tom foster said that at one point in the 5-mile radius, you are seeing those