Three days ago, the Scotland's Sunday Herald published an article about a weapons shipment from the US to the US/UK airbase on Diego Garcia. "According to a cargo manifest from the US navy, this included 387 “Blu” bombs used for blasting hardened or underground structures. [...] Crucially, the cargo includes 195 smart, guided, Blu-110 bombs and 192 massive 2000lb Blu-117 bombs." The article concludes: "Experts say that they are being put in place for an assault on Iran’s controversial nuclear facilities."
Whoever those "experts" are, this news could indicate that a strike on Iran is in preparation. This would not come as a surprise, bearing in mind the continuous threat of the use of force by the US and Israel against Iran. On the other hand, a quick Google search reveals that Blu-110 and Blu-117 are not exactly what you could describe as bunker busters. They are mainly used as precision-guided bombs for all sorts of targets. Hence, they could be tagged for Iran as well as any other of the many places the US decided to bombard on a regular base.