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The assassination of Charlie Kirk offers the latest example of how ordinary security measures can be defeated in an era of escalating political violence, when anyone associated with the political process is a potential target, including influencers.Related video above: Charlie Kirk’s killing stuns Washington; Calls grow to lower political temperature, increase securityKirk was in a familiar setting on Wednesday before a large crowd at a university in Utah, a red state where voting trends largely aligned with his conservative views. The political activist appeared with his own security team, as he has at scores of events on other campuses.Security experts interviewed by The Associated Press questioned whether the event was sufficiently staffed but also acknowledged the limitations of both campus police forces and outdoor venues. They said only the inner ring closest to Kirk appeared to be secure, leaving the outer and middle rings exposed.The killing, apparently carried out from a nearby rooftop, had eerie parallels to the assassination attempt last year against President Donald Trump in Pennsylvania, where a 20-year-old gunman managed to climb on top of a nearby building and open fire during a campaign stop.Law enforcement officials were still searching for the shooter Thursday. Authorities said the assassin used a high-powered, bolt-action rifle and jumped off that building as spectators fled the scene. The FBI released two photos of a "person of interest." Many details remained unclear, including what precise security measures were taken ahead of the debate hosted by Kirk's nonprofit political organization, Turning Point USA. The event at Utah Valley University drew more than 3,000 people.Hours after the attack, Jeff Long, the campus police chief, told reporters that six of his officers staffed the debate, and that his department had coordinated with Kirk's own security team. He noted that Kirk had been speaking "in a lower area surrounded by buildings" but did not say whether officers had inspected nearby rooftops."This is a police chief's nightmare," Long said. "You try to get your bases covered, and unfortunately today we didn't, and because of that we had this tragic incident."Related video below: Numbers Show Rising Threats Against LawmakersStudents told AP they saw no metal detectors or bag checks, though the level of security appeared consistent with other speaking engagements on Kirk's national tour. As Kirk was not an elected or government official, he or his organization likely would have had to pay for security beyond what the university provided."They probably didn't have enough security personnel there," said Ron Williams, a former U.S. Secret Service agent who now works as a private security consultant. "And the reason is because they really didn't see the need, especially in Orem, Utah, which is a low-crime area." It was unclear whether Kirk had received specific death threats or other indications he was in danger. Even if he had, experts said it can be difficult to provide airtight protection for a private individual without a presidential-level security detail. Donald Trump Jr. acknowledged the inherent security risks of political events in July as he spoke alongside Kirk at a Turning Point USA summit in Tampa, Florida. The younger Trump recalled a 2016 campus event in which he said he appeared with Kirk even after Michigan state police warned that they could not guarantee the two men's safety.High ground offers 'direct line of fire'Utah is one of 14 states that allow some level of concealed carry of firearms on public college and university campuses. In May, a law took effect allowing anyone at least 18 years old with a valid Utah concealed weapon permit to carry a weapon on campus.Williams said a uniformed officer should have been posted atop the university's Losee Center, about 142 yards from the tent where Kirk was shot. Authorities believe the gunman fired from that rooftop."If you have a high ground issue, you've got to take care of that first," said Williams, who protected four presidents and visiting foreign dignitaries during 22 years with the Secret Service. High ground gives a shooter "a direct line of fire."Related video below: Utah Valley University students recount terror after assassination of Charlie KirkWilliams also questioned the decision to hold the event outdoors. An inside venue, he said, would have allowed for security checkpoints.Another former Secret Service agent, Joseph LaSorsa, said it was impossible "to secure 3,000 people" with half a dozen officers. "They didn't have perimeter security. They didn't have counter-sniper. They were wide open," said LaSorsa, who protected three presidents during a 20-year career with the Secret Service.Kirk's security team was likely most concerned "with people rushing the stage" or bothering him as he returned to his vehicle, said Bobby McDonald, a former Secret Service supervisory agent who is now a criminal-justice lecturer at the University of New Haven. A longer-range shooting, he said, was likely not even on the radar. "I'm not sure if there were 20 police officers there that this type of event wouldn't happen at that college setting," McDonald said. "This person knew what they were doing with that firearm." Events at colleges can be exceedingly difficult to secure, especially when they involve a controversial figure, said David B. Mitchell, the chief of the University of Maryland Police Department. Student groups like to showcase such speakers because they draw big crowds."This is going to send shock waves across college campuses," Mitchell said, because there are many similar events "happening all the time."Mitchell's 100-officer force helps secure events involving high-profile politicians and other figures due to the school's proximity to Washington. Former President Barack Obama has attended at least two University of Maryland basketball games. Such events require extensive preparation."It's the Charlie Kirks of the world who don't have large security details like that — certainly not to the level of the president or other elected officials — and yet they can still be a target," Mitchell said. "There is really only so much you can do, given the circumstances."___Associated Press journalists Hannah Schoenbaum in Orem, Utah, Del Quentin Wilber in Washington and Christopher Keller in Albuquerque, New Mexico, contributed to this report.