Four people were arrested this week in connection to a house fire that killed three people on Nov. 18 in Washington County, police said.

Investigators found signs of foul play at the home, including K-9 alerts for accelerants and injuries to the victims that were not fire-related, according to Maryland State Police. It did not appear to be a random act of violence, state police said in a press release.

The three victims, Brittany Ray, 31, Harold Flichman, 36, and Brianna Mae Weishaar, 25, all lived at the same single-family home on the 13000 block of National Pike in Clear Spring. Firefighters responded to reports of the blaze just after 5 a.m.

The four suspects arrested are Darnell Hawkins, 47, of Baltimore; Tony Smith, 43, of Hagerstown; Maurice Mouzon, 46, of Baltimore; and Kierra White, 35, of Glen Burnie.

Hawkins and Smith were charged with three counts of first-degree murder and one count of first-degree arson. White was charged with acting as an accessory after the fact to murder.

Mouzon was charged with conspiracy to commit armed robbery, distribution of narcotics and a handgun violation. Mouzon is also facing separate charges stemming from narcotics found during his arrest, state police said.

Investigators expect to arrest more suspects.