Car Will Not Start problems of the 1997 Buick Riviera

This morning I tried to start the car to get my kids to school, I turn the key but the engine didn't start, immediately a big loud explosion (the car never started), then smoke came out from under the hood, I got out to open the hood and fire was coming out of the engine right next dashboard near the driver side. . . . . The fire department had to come to get the fire out.