Huge Explosions ? Tremors in NW Florida

At 4.29PM this afternoon there were multiple very large noises/explosions?

They were not sonic booms but were as loud as when the Shuttle re-enters.

These sounds were more of a continued rumbling like thunder but obviously not thunder.

The local Cops and FD are out checking the area but are mystified as to whats going on.

The area I am (fishing actually) in today is 70 miles west of Gainesville Florida

Anyone else hear them?

nothing out of the ordinary in South Florida, and I didn't hear anything while I was out at that time... but we are quite far apart.

Will be interesting to see what you find out about this.