An American teenager is accused of bashing his parents to death with a hammer in a "merciless" killing before hiding their bodies and throwing a party for 60 of his friends.
Tyler Hadley, 17, used Facebook to invite friends to a party at his house in Port St Lucie, Florida, on Saturday afternoon, before using a 56-centimetre framing hammer to beat his parents to death.
Port St Lucie Police spokesman Tom Nichols said Blake and Mary-Jo Hadley were allegedly beaten on the head and torso outside their master bedroom, CNN reported.
The teenager then dragged their bodies into the room and covered them up with "books, files, towels, anything that he could find inside the home to cover the bodies", Mr Nichols said.
About 60 of his friends then turned up for the party, where a rumour went around that Hadley had killed his parents.
Police were tipped off about the killings and went to the home about 4.20am on Sunday, where a "nervous" Hadley told police his parents were out of town, police captain Don Kryak said.
Officers found the alleged murder weapon lying between the bodies.
"It was a merciless killing," Mr Kryak told local news website TCPalm.com
"It was brutal and the Facebook invitation - a party to have your friends and 40 to 60 people come over - I think speaks for itself.
"The blunt force trauma to the head and torso with a 22-inch framing hammer can effect a considerable amount of injury."
Police are unsure of a motive, but a partygoer told the local television station that the teenager killed his parents because they would not let him throw the party.
Mr Hadley worked at a local nuclear plant and his wife was a teacher in the area for 24 years, TCPalm.com reported.
The couple had lived in the house where they were killed for about a decade and an older brother had moved out a few months ago.
A family friend, Charlene Moses, said she had known Mrs Hadley since they were teenagers.
"They are a nice family. The kids are always nice. They used to come to our house trick-or-treating and they always called me Miss Charlie."
Mr Nichols said Hadley was being held without bail in a local juvenile detention centre.