A mother and her 13-year-old son were found dead in their Kensington home and detectives believe the case is a murder-suicide, Montgomery County police said Wednesday.

Margaret Ferne Jensvold, 54, and her son, Benjamin H. Barnhard, 13, were found dead in their bedrooms on Tuesday, police said. Officers had gone to the home, in the unit block of Simms Court, after one of Jensvold’s co-workers called to report that she had not been heard from in several days.

Police did not immediately say which of the pair they think killed the other. They said both mother and son had “evidence of trauma” to their bodies, but did not elaborate.