Two men and two women were found dead Monday afternoon at a Virginia home outside Washington, D.C.
A person of interest was being interviewed, police said.
Prince William County police discovered four bodies after they were called to a home in Woodbridge, about 20 miles south of Washington, at about 4:30 p.m.
"When officers arrived, they located the residence unsecured and conducted a welfare check," the police department said in a statement. "Once inside the home, officers located four adults in different parts of the residence suffering from gunshot wounds."
Investigators think the shooter and victims knew one another other and called the circumstances "domestic."
The names of the victims have not been publicly released, nor has the identity of the person of interest.