Secret Service Director Kimberly Cheatle told ABC News on Monday that the reason there were no security personnel atop the structure where a gunman took shots at former President Donald Trump was because of “safety” concerns about the slope of its roof.

“That building in particular has a sloped roof at its highest point. And so, you know, there’s a safety factor that would be considered there that we wouldn’t want to put somebody up on a sloped roof,” she said according to Fox News. “And so, you know, the decision was made to secure the building, from inside.”