A mother and her adult son were found shot to death inside a house in Fort Washington Thursday, Prince George’s County police said.

Officers responded to the home, in the 11800 block of Hickory Drive after Frank Harris, a resident, placed a 911 call about 4:30 a.m., police said. They said Harris’s wife, Patricia, 56, and son, Frank, 20, were found dead. Each had been shot multiple times.

Police said they are investigating the case as a double homicide.

There were no signs of forced entry into the home, police said. Television footage from the scene showed yellow crime tape surrounding a single-family brick home with a landscaped lawn.

This post has been updated.