Four people were found dead in a home in a suburb north of Baltimore, and police said Sunday that officers had made an arrest in the case.

Police planned to release details at a midday news conference Sunday, said Bill Toohey, a spokesman for the Baltimore County Police Department.

The victims were a man, a woman and two teenage boys. Police did not immediately release their names or say if they were related.

Toohey would not say whether there were any obvious signs of trauma or describe the condition of the bodies.

A 17-year-old boy who lives in the house arrived there Saturday afternoon and found the man's body, then left and called 911, police said Saturday night. Officers found the other three bodies inside the house on a wooded lot.

The teenager had been away from home Friday night, and the father of a friend drove him back Saturday, Toohey said.

Investigators were awaiting autopsies to determine the cause of death.

"We're walking very, very carefully through this," Toohey said Saturday.