How close could a sniper get to the inauguration site?

[TexasProgresive]

50. Some of us remember the assassination of Anwar Sadat October 6, 1981

By Lieutenant Khalid Ahmed Showky Al-Islambouli.

From Wikipedia:

Islambouli and his platoon originally were not supposed to participate in the October parade, but they were chosen by the Military Intelligence, which was infiltrated by Islamist sympathizers under Colonel Abbud al-Zumar, to replace a platoon from the 133rd Artillery Battalion which was excused from participation for apparently failing some routine tests and checks.[4]

Once his platoon containing three heavy trucks towing M-46 field artillery guns began to approach the President's platform, Islambouli, along with Junior Sergeant Abdelhameed Abdul Salaam, 31, Corporal Ata Tayel Hameeda Raheel, 21, and Corporal Hussein Abbas, 21,[5] leapt from their truck and ran towards the stand while lobbing grenades toward where the President was standing with other Egyptian and foreign dignitaries.

The massive amount of National Guard and law enforcement does not quell my concerns. All it takes is one kill squad among them. We already know that many of the police and military are supporters of the right wing extremists.