Four people have been arrested as part of the investigation into a deadly fire in Washington County, Maryland. Two women and one man were killed on November 18th in a house in the 13-thousand block of National Pike in Clear Spring. Investigators began to suspect foul play after finding accelerants inside the house and trauma to the victims’ bodies. The Maryland State Police announced the arrest of three men and one woman on Saturday. Two of the men arrested have been charged with first-degree murder, first-degree arson and other crimes. Investigators say more arrests are expected.