New details emerged late Wednesday about the suspect in an ambush on two National Guard troops in Washington, D.C., according to CNN.

CNN law enforcement expert John Miller revealed that the FBI has learned the identity of the gunman, whom they suspect of acting alone. The gunman is believed to be a 29-year-old immigrant who lives in Washington, Miller reported. He added that the FBI is working to confirm more details about the shooter before releasing his name.

The shooter is not cooperating with law enforcement, CNN also reported.

The shooting happened on Wednesday afternoon at the intersection of 17th St. and I St., which is blocks from the White House.