It surly looks like intentional jamming but I did not want to draw any conclusions that are not in the source. It certainly does not look like any random event but it could still be unintentional, e.g. someone just forgot to turn of his GPS jammer or accidentally broadcasts on that frequency, but that is admittedly not the most plausible explanation. I am also not sure how big a deal the whole thing is, I would assume that GPS jamming is not too uncommon to protect potential high profile target.