An 18-year-old man has been arrested on suspicion of murdering Leonne Weeks, 16, who was found dead on a path in Rotherham.
Police say they're doing all they can to find the person responsible after a man was stabbed on a train to London from Kent.
The 23 year old was attacked on a Gillingham to Victoria service as the train arrived at Swanley at around 8.15pm on Tuesday 7 April 2015.
The man was treated at the scene by paramedics and taken to hospital with multiple stab wounds.
Detective Inspector Andy Rose, leading the investigation, said: “I am appealing for anyone who witnessed this incident, and has not yet come forward to police, to do so as a matter of urgency.
“We treat all incidents involving knives extremely seriously and the public can be assured that we are doing all we can to find the person responsible.”
Officers have been analysing CCTV footage of the incident and are currently pursuing several lines of enquiry.
The train was taken out of service and examined by specialist forensic officers.
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting S/B6 of 08/04/2015. Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.
A career in the media and entertainment industry starts here...
A man has been fined £1,800 for flying drones over Parliament, near Buckingham Palace and over football stadiums.
Government to investigate after some restaurants accused of withholding tips
Most Viewed Pictures On Heart
Recently Played Tracks
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Get some great ideas on how to advertise your business on radio, online and on mobile.