A police officer has discovered the bodies of his murdered parents at their home.
Detectives have not ruled out the possibility that the killings were a revenge attack linked to their son's work.
Avtar Kolar, 62, and his wife Carole, 58, were found in the Handsworth Wood area of Birmingham, West Midlands Police said.
Detective Superintendent Richard Baker, who is leading the inquiry, said: "It was obvious from the scene the couple had been assaulted and had more than likely died of their injuries."
He added: "We currently have over 60 detectives from West Midlands Police CID along with a lot of our uniform colleagues working around the clock to catch the offenders responsible for this and bring them to justice.
"I can assure the local communities and the family that we will catch the people who have done this horrendous crime."
The couple, who have four sons, were discovered in their home on Friary Road. One son, who serves with the West Midlands force, found them after his parents failed to answer the phone.
Mr Baker said: "At 7.15 last night a family member spoke to Carole and there were no issues. At 8am this morning their son went round to find the couple dead at the scene."
He said they had eight grandchildren and that this was a very difficult time for the "close-knit, loving family".
Forensic post-mortem examinations will be carried out either Thursday or on Friday.