Law enforcement officials are preparing for any potential security threats ahead of Marathon Monday.A threat assessment from the FBI obtained by ABC News showed no specific threats ahead of the Boston Marathon, but it outlined a number of factors police are keeping a close eye on. It identifies a few broad risk areas, so-called soft targets. Those include spots like public viewing areas.The assessment said that whenever there is an event of such a scale, the biggest threat comes from individuals or small groups of bad actors. >> Download the free WMUR app to get updates on the go: Apple | Google Play <<Security officials also noted that the marathon is falling near some notable anniversaries that could inspire terrorism, including the Oklahoma City bombing, the Columbine school shooting and, of course, the bombing at the marathon finish line in 2013. Former Boston police commissioner Bill Evans says said security and cooperation around the marathon has been increased considerably in the past decade. "Boston does a super job, especially since the bombing, with the technology, with the bag checks, no doubt about it," Evans said. "But again, it's 26.2 miles, and it's very difficult doing an open-air event and locking it down."Evans said that even with the heightened security and technology, the best tool to keep everyone safe is the public, as officials ask everyone to stay alert and enjoy the day safely. Spectators are prohibited from bringing a number of items to the marathon. Those items include Backpacks, large blankets, coolers, selfie sticks and costumes. You can find more spectator information on the Boston Athletic Association's website.