What is known and not known about the attempt on Trump's life and its aftermath

So far, details about the man who authorities say tried to kill former President Donald Trump amount to little more than a stick-figure drawing: a politically enigmatic loner who worked in a nursing home.

Still absent are the motivations behind the assassination attempt at Saturday’s rally in Pennsylvania.

That’s not all. Investigators are still trying to piece together how Thomas Matthew Crooks eluded Secret Service agents and local police.

Officers and spectators alike took notice of Crooks before the shooting. And the roof of the building that he fired from appeared to be unsecured, l eaving a security expert baffled.