Over the past two months bomb threats have increased for US synagogues. This hasn't gotten the coverage it deserves in the current political climate. More than 26 synagogues and Jewish institutions have been targeted with threats, or "swatting." They appear to be targeting synagogues that livestream videos of services online. Which implies that somewhere online someone is watching -- Some 4chan posts hint that some of these trolls may use that site.
https://forward.com/news/557648/bomb-threats-and-swatting-campaign-hits-dozens-of-synagogues/?amp=1