As we come on the air, new details are pouring in about that dramatic shooting in washington, d.C. Today. A gunman, walking into the lobby of a powerful conservative organization, the family research... See More
As we come on the air, new details are pouring in about that dramatic shooting in washington, d.C. Today. A gunman, walking into the lobby of a powerful conservative organization, the family research council, and shouting something mysterious and pulling out a weapon and firing it. He wounded a security guard who still, somehow, managed to wrestle the shooter to the ground, saving untold lives. Abc's senior justice correspondent pierre thomas has the latest at this hour. Reporter: This is the man police suspect was about to begin a shooting spree at one of the nation's best known conservative groups on family issues. A potential disaster may have been averted because of the work of this security guard, videotaped by abc washington affiliate wjla, as he was being transported from the site after being short. The security guard is a hero as far as I'm concerned. Reporter: Police say at 010:45 this morning, the suspect walked into the lobby of the family research council and was confronted by a security guard as the suspect yelled something suggesting he did not agree with the council's policies. Sources tell abc news the man pulled out a .9 millimeter handgun, firing a shot and wounding the guard before he was wrestled to the ground. Sources have adent if ied this man as the suspect. So far, his motives are unclear. Nothing about him or his circumstances to be able to determine his connection to this group. Reporter: But police have not ruled out the possibility the incident was politically motivated, ginn the suspect's alleged rant and the family research council, which promotes conservative positions on hot button issues like abortion and gay rights. Authorities were taking no chances and could be seen sweeping the area for explosives following the arrest. Sources say the suspect had material from fat food giant chick-fil-a, but it was unclear whether the incident has any connection to the recent controversy over gay marriage. The owner recently set off a political firestorm saying he opposed gay marriage. Republican presidential candidate mitt romney said in a statement, "there's no place for such violence in our society." He also said he was praying for the family research council after the day's horrific events. And pierre, I keep thinking of that security guard, managing to save lives though he was wounded. How is he tonight? Reporter: He's in stable candidate, diane. Recoverers from a gunshot wound to the arm. The remarkable thing is that he helped subdue the suspect, even after being shot. A real hero, diane. Reflexes were incredible. Thank you so much, pierre.
This transcript has been automatically generated and may not be 100% accurate.