FBI agents converge on the driveway of this home in West Memphis... after the Family Practice Physician who lives there wasairflighted to thehospital. The doc was sitting in his vehicle when itblew up. FBI National Headquarters is saying agents are at the scene along with ATF and theShelby County Bomb squad.

FBI agents telling Fox News they are "not sure of the origin" of the explosion. FBI also telling us, "Don't be surprised if this turns into a [car] malfunction."

Dr. Trent Pierce specializes in asthma and is the Chairman of the Arkansas Medical Board. He's reportedly in critical condition after the explosion. And, authorities are hovering over the vehicle right now looking for the cause.

H-out