west yorkshire police
No arrests have yet been made.
One force received a record-breaking number of 999 calls in 24 hours.
Three teenagers and one man have been named locally.
Their bodies were recovered by police.
Detectives are appealing for information.
The 80-year-old died shortly after his conviction for a 1972 rape.
Officers can now access all the UK's fingerprint databases on their smartphones.
The 11-year-old was last seen on Monday.
He was pronounced dead at the scene.
Two 15-year-old boys are in police custody.