RICHMOND - Virginia officials filed the state's first murder charges against the sniper suspects Monday, and a prosecutor said the teenager in custody may have killed an FBI analyst during the spree.

Fairfax County prosecutor Robert Horan Jr. said there is "an equal possibility" that John Lee Malvo, 17, or John Allen Muhammad, 41, gunned down analyst Linda Franklin outside a Home Depot on Oct. 14 in Fairfax.

"There will be some evidence that the juvenile was the shooter just like there will be evidence that the adult was the shooter," Horan said. "But the point is, we don't know right now, and no one knows right now."

The pair was charged in Spotsylvania County with the murder of Kenneth Bridges on Oct. 11 and the wounding of an unidentified woman Oct. 4. Both shootings were part of the three-week string of attacks that left 10 dead and three others wounded in Virginia, Maryland and the District of Columbia.

Muhammad was indicted on charges of capital murder, conspiracy to commit capital murder, attempted capital murder, aggravated malicious wounding and use of a firearm in a felony.

Malvo was charged with the same offenses in juvenile court but authorities will seek to have his case transferred to adult court at a hearing Friday.

The indictment comes as county, state and federal prosecutors in multiple jurisdictions work to figure out who should bring the two men to trial first.

The suspects already face six murder charges in Maryland and capital murder charges in Alabama in connection with a fatal robbery there last month. They also could be charged with federal extortion and murder counts that could bring the death penalty.

Prosecutors in Virginia say they could win death sentences against both suspects. In Maryland, 17-year-olds are not eligible for the death penalty.

Montgomery County, Md., prosecutor Douglas Gansler told the AP on Sunday that he still believes his state should prosecute the case first, but "we're open to discussions with all the jurisdictions."

Gansler acknowledged that the toughest sentence Malvo could get in Maryland would be life without parole, but argued that his state has the strongest case because it suffered the most fatalities.

The top elected official in Montgomery County urged prosecutors to choose the strongest venue.