[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/CRIME/06/10/museum.shooting/art.security.guard.museum.jpg caption="Stephen Tyrone Johns was shot and killed while working at the U.S. Holocaust Memorial Museum on Wednesday."]
WASHINGTON (CNN) - Justice Department sources say no preliminary decisions have been made on what charges may be brought against the gunman in the Holocaust Memorial shootings, if the shooter survives his gunshot wounds.
Officials said it was likely that the Metropolitan Police Department may lead the investigation if a decision is made to proceed with firearms or shooting charges, while the FBI will likely be the lead if evidence leads them to file federal civil rights-related charges.
An official says if the shooter survives, charges can be brought against him whether or not he is physically able to appear in court, and if and when he becomes physically able to do so the prosecution would then commence. But it will likely be hours - maybe days - before a decision is made.
Prosecutors had no information on the suspect's medical condition.
UPDATE, 5:55 p.m.: Now that security guard Stephen Tyrone Johns has died, the rifle used by the suspect has potentially become a murder weapon. It is currently in the hands of the U.S. Park Police, which has asked the Bureau of Alcohol, Tobacco and Firearms to urgently trace the weapon.
The ATF has asked its weapons tracing center in West Virginia to expedite a trace on the rifle, which could be completed by tomorrow. The trace should at a minimum provide the original sale and ownership of the weapon. The ATF is also trying to determine where the weapon has been, and how it came to be used in the deadly shooting at the Holocaust Museum.
One of many questions is whether the suspect was a convicted felon who should either have turned in his weapons or been barred from owning them.
Related: Guard killed during museum shooting