A B-52 was shot down over the US by a F-100 in the late 1950's / early 1960's during a PI, when an electrical fault caused a Sidewinder to be launched when the Super Sabre pilot pressed the trigger to operate the gun camera. However the incident happened over New Mexico if memory serves. I think 3 of the B-52 crew were killed. Edit - Info
Shootdown: the death of the B-52 Ciudad Juarez The incident happened in 1961, and the Hun was from the New Mexico ANG. The fault with the launcher is thought to be the same as that on the F-14 which resulted in the shoot down of a USAFE RF-4C over the Med as stated above