Corpses believed to be 14-year-old Ivy Webster and 16-year-old Brittany Brewer were found when officers searched the property where the sex offender, Jesse McFadden, lived, Okmulgee County Sheriff Eddy Rice said at a news briefing posted online by television station TOTV in Tulsa.

Other bodies likely included McFadden and members of his family, Rice said, cautioning that none of the victims had yet been formally identified by the county medical examiner.

The county issued an amber alert earlier Monday saying the two teens were missing, but the alert was called off after the bodies were found.

"Our hearts go out to the families and friends and schoolmates and everyone else," Rice said. "It's just a tragedy."

Rice said officers arrived at about 3 p.m. to search the property and found the bodies. They are no longer looking for the missing teens or for McFadden.

(Reporting by Sharon Bernstein; Editing by Leslie Adler)