The deadly bombings near the finish line of the Boston Marathon on Monday served as a reminder that no one's safety is guaranteed.

Boston deals with the aftermath of the deadly marathon explosions (Spencer Platt, Getty Images)

Several officers and security officials were nearby for the double blasts, but that made no difference in the result. Someone, or a group of people, wanted to terrorize the annual event, and they succeeded, killing three people in the process.

"Hours before the race started, there were bomb sweeps that were completed," said John Gomez of Group Espada, a consulting firm in Red Bank that focuses on special operations and counterterrorism.

Gomez said it would be a fantasy to believe that security will be 100-percent at any public event, and that tragedies like the one on Monday will never happen.

Officials indicated that the recipe for the explosives discovered at the scene could be found on the Internet. Gomez said it's very difficult to detect an explosive of such a low grade.

"That's what makes it so scary," he added.

Sometimes, the public's alertness can be a solid tool in preventing attacks. Gomez echoed the ever-popular advice of government officials and other experts in the field - if you see something, say something.

"The best thing we can do is stay vigilant," Gomez said. "I think, without making people paranoid, that we do need to be heightened. We do need to understand that these types of attacks can happen. They probably will, unfortunately."

New Jersey residents reacted strongly to the bombings, saying it brought back feelings they experienced post-9/11.

"Now, it's something everyday," said Pam Schertzer of Marlboro. "You don't know what tomorrow will bring."

"I fear for the people I love - my family, all my kids," added South Amboy resident Donna Hoder.

A Manalapan man told Townsquare Media the only thought that comforts him is the fact that there are more good people in the world "than these lousy scumbags" who carry out terroristic attacks.