Detectives re-investigating the unsolved murder of schoolgirl Elsie Frost received numerous calls and emails during the weekend.
Elsie was found on the ABC steps, near Horbury Lagoon and the Calder and Hebble Canal, at around 4.15pm on October 9, 1965, after being stabbed several times.
And on Friday her brother Colin Frost visited the scene of her brutal murder to make an emotional appeal for help in finding her killer after the case was reopened.
Police said they were following new lines of enquiry in the case and have released a new picture of Elsie and a map tracing her final movements.
Detectives now want to trace a man in a white coat who was seen riding a bike near close to scene on the day of the murder.
He was not interviewed during original police investigation.
They also believe Elsie may have been seeing somebody in secret - possibly a boyfriend - during the weeks before her death and are keen to identify that person.
Detective chief inspector Elizabeth Belton, is leading the enquiry, and said Elsie and her family could still get justice despite the length of the time since her murder.
She said: “If there is any new line of enquiry in a unsolved case then we will reinvestigate. And we do have new information.
“We want justice for Elsie and her family. We want to give them the answers as to what happened that day.”
Anyone with any information should contact the police major investigation review team on 101 or call Crimestoppers, anonymously, on 0800 555 111.