(FOX News) A security guard at the Family Research Council’s headquarters in Washington,  D.C. is being hailed as a hero after he stopped a gunman posing as an intern,  taking a bullet in the arm before wrestling the suspect to the ground.

The gunman entered the lobby of the organization’s Chinatown headquarters  around 10:45 and expressed disagreement with the conservative group’s policy  positions, Fox News has learned. When the guard, who was not identified, asked  him where he was going, he opened fire, according to police.

“The security guard here is a hero, as far as I’m concerned,” D.C. Police  Chief Cathy Lanier said. ”He did his job. The person never made it past the  front.”

The guard, who was not identified, was shot in the arm and was conscious  after the shooting and was in stable condition. The gunman, who also was not  identified, was being questioned by the FBI, sources said. Sources said he is in  his twenties.

The suspect “made statements regarding their policies, and then opened fire  with a gun striking a security guard,” a source told Fox News. WJLA-TV7 reported the  suspect was also shot.

Sources also said the gunman may have been carrying a bag from Chick-fil-A,  the embattled fast-food restaurant whose president came under fire from gay  activists after he said he did not agree with same-sex marriage.

Sources told Fox News that after guard took away his gun, the suspect said,  “Don’t shoot me, it was not about you, it was what this place stands for.”

Authorities were treating the attack as a case of domestic terrorism,  although James McJunkin, the head of the FBI’s Washington Field Office, said  authorities do not yet know the gunman’s motive.  (read more)