The earliest report is dated January 2nd, 2016.
Since then Special Agent Breja's investigation turned up three more incidents.

In every case the pattern is the same. A team of highly trained special forces operatives is about to engage a terrorist group barricaded in an office building. Upon being given the "breach" order, the team experienced what could be described as total paralysis, or even time being frozen. The same unexplained phenomena seems to affect the terrorists. Whether it is an effect of a new weapon, a nerve gas of some sort, a time distortion or something far more sinister is still undetermined. Case remains open and unsolved.

Non- flavor text version: As you can see under the second link, I have experienced a game-breaking problem with Breach & Clear. In the very first mission, when I click the "breach" button, nothing happens. The team just stands in place, and there is nothing I can do. The thread in the game's sub-forum only turned up two more users with the same problem, and a google search only found that one post (first link), without any responses. Does anyone have any ideas what's up, or is it just aliens?