this is cnn breaking news. >> welcome back. i'm chris cuomo with john berman here in boston. the big story this morning breaking news, a massive explosion at a fertilizer plant in the small texas town of west, just north of waco. >> officials right now giving a preliminary estimate of 5 to 15 people killed. but again, it is early. that number possibly could rise. number of injured very high, also. more than 160 people have been injured, taken to local area hospitals and there is a search and rescue operation under way which will get more intense as day light comes up there. >> you have to imagine this is a very small town. less than 3,000 people. they only have three ambulances. luckily responding around the