Fairfax County police resumed their search for human remains in Holmes Run park early Thursday, a search they began after receiving a tip.
Investigators spent Wednesday searching the grounds of that park and Lemon Road Park in the Falls Church area. Late in the day, the police reported that they had completed the search in Lemon Road Park without finding anything.
Police say the investigation may be gang-related.
The searches could continue for an extended period of time.
Recently, police in northern Virginia recovered the bodies of two people they believe were killed in gang-related attacks.
The first victim was Christian Sosa Rivas, who was killed in Prince William County in January. A search warrant filed in court revealed that Sosa Rivas had styled himself as a leader of a local clique of the gang MS-13 -- a claim that didn't sit well with other gang leaders.
Police believe Sosa Rivas was lured away from his normal surrounding and murdered.
Police have since tied his death to the murder of 15-year-old Alexandra Reyes. Investigators working on Sosa Rivas' case found Reyes' body last month near Lake Accotink in Springfield; she had been missing for two months.
A total of 10 suspects have been charged in connection with the girl's abduction and death, the majority of the suspects are juveniles. Police believe everyone involved is acquainted or affiliated with one gang, Fairfax County Police 2nd Lt. Brian Gaydos said.
Reyes' family members have identified that gang as MS-13.
Police have not said whether their search is connected to the murders of Rivas and Reyes.