The All Dulles Area Muslim Society (ADAMS) in Sterling on Monday identified the missing girl as Nabra. Her last name is currently being withheld.
Local media reports that Nabra was a student who just finished her second year of high school.
"We are devastated and heartbroken as our community undergoes and processes this traumatic event," ADAMS said in a statement. "It is a time for us to come together to pray and care for our youth."
Nabra was last seen with a group of Muslim teens in the early hours of Sunday after having a meal at a local 24-hour restaurant near the mosque, where she attended prayers for Ramadan, a 30-day long holiday during which Muslims fast from dawn until sunset, according to reports from ADAMS and local police.
The group was confronted by a motorist. All others in the group managed to flee.
Police arrested and charged Darwin Martinez Torres, 22, with her murder on Sunday evening.
At a press conference on Sunday, TJ Wright, Fairfax county police public information officer, said there "doesn't seem to be any indication" that the murder was a hate crime, but more information would come out as the investigation proceeds.
Anti-Muslim hate crimes have surged in recent years.
According to a report by the Council on American-Islamic Affairs (CAIR), an Islamic civil rights organisation, released in May, there was a "57 percent increase in anti-Muslim bias incidents" from 2015 to 2016.
"This was accompanied by a 44 percent increase in anti-Muslim hate crimes in the same period," the report found.
President Donald Trump's campaign rhetoric and moves to institute a "Muslim ban", or halt to immigration from six predominately Muslim nations, has attributed to this rise, critics say.
