The dead were discovered shortly after 5 p.m. when the boy, who had spent the previous night with friends, returned home in the 10900 block of Powers Ave.
When police arrived they found a total of four bodies: an adult man and an adult woman as well as two teenage boys in several rooms. There was no sign of forced entry, he said.
Toohey declined to provide further details but said homicide detectives were investigating the deaths.
"We still don't know what's behind it, so I can't offer any reassurances or further details," Toohey said.
Last night, police cruisers flooded the street as about a dozen neighbors stood across the street from the home, many embracing and in tears. Most of the neighbors said they knew little about what had happened.
Toohey would not release the names of the victims.
There were no arrests as of last night, he said.
State tax assessment records indicate that the home, a two-story Colonial, is owned by John W. and Tamara Browning, who several neighbors said had been occupants of the house for the past decade.
Police confirmed last night that they are the owners.
Neighbors were distressed at the possibility that the dead would be identified as the Brownings.
Virginia R. Lyon, 80, who said she has lived on the street for the past seven years, said that Browning was a lawyer who lived there with his family.
"This is a shock," Lyon said. "To my knowledge, I don't think there's any problems there, to my knowledge."
The house was built and bought by the Brownings in 1994.
Another neighbor, Robert Owens, said the Brownings and their three sons lived at the house.
"He was a wonderful person, a Scoutmaster, a lawyer, a wonderful guy," a distraught Owens said of the father, whom he identified as John Browning, before hanging up the phone.
According to public records, John Browning is an attorney with the law firm, Royston Mueller Mc Lean & Reid in Towson.
According to the company Web site, he was born in Baltimore and graduated from James Madison University, receiving his law degree from the University of Baltimore.
The Web site says: "His practice focuses on real estate law and commercial and corporate law with emphasis on sales, acquisitions and reorganization of businesses, employment, franchises, lending and bankruptcy law.
"John is actively involved in community, civic and service organizations and scouting."
He also served as the chairman of the Land Records Committee for Baltimore County.
Police were canvassing the neighborhood last night for witnesses.
A preliminary cause of death was expected to be released today after the bodies had been examined by the medical examiner, Toohey said.
"We should know more tomorrow [Sunday]," Toohey said.
The age of the teenager who found the bodies was misstated when this article was published in the print edition. The Sun regrets the error.