Any idea why?
Apparently, officials feel showing the building(s) up close could compromise the scene.
Could be that the perp(s) have some access to media broadcast.
Officials don’t want to give perp(s) info on what is taking place (SWAT movements, etc.) in the general area.
Perhaps so the perps in the building won't be able to watch a live TV feed showing where the cops are gathering and what they're up to.