This operation is extremely involved.  Only highly experienced and trained personnel can provide this protection.  There are many areas of difficulties.  The capability of successfully working with the different agency is extremely complicated and involves planned strategic tactics and extensive planning in securing the premises, specifications of primary and secondary teams, inner and outside perimeter teams and boundaries,  the route course taken to and from the location, the secondary route if complication should arise,  and the precise action to be taken in the event of an emergency.  The media is also something that must be handled in a professional yet diplomatic manner to avoid extreme ramifications to all parties.