If it was a gunman from a rooftop using a long gun, how did they...

If it was a gunman from a rooftop using a long gun, how did they get to him so quickly??

How was it allowed?? who was in on it???

Can his mobile phones be investigated or have they been wiped so no trail to be made?

Makes one wonder who else was involved and why?? What are they trying to prevent by taking Trump out, what are they afraid of Trump doing???

How did he learn to use a long gun?? If there is not trail what conspiracy is this and who else is involved?