As for radio hams jamming the signals, I'd say that was unlikely - you're looking more for a technical equivalent to the idiot who smashes up railway signalling gear or finds it funny to play with laser pointers under a flight path
Indeed. For example, your bog standard radio ham won't have the kit, or money nor inclination to degrade that spectrum (which is generally proved
here )
However, the jammer is getting somewhere with
this malarky. Although, that's maybe a good thing!
Solar Flare activity is currently nil - has been for months - so that's ruled out.
GPS jamming? It's a new one on me.
GPS freq's are between ( i think ) 1175-1575 Mhz...way high up the spectrum. Would take something sophisticated to drown out from there.
More than likely the Government bodies testing new comms development, which none of us will never really know about - then, out of the blue, you'll hear about another thwarted terrorist attack - c'est la vie nowadays.