A teenager who died of a suspected drugs death has been named locally as talented showjumper Hannah Bragg.
15-year-old Tavistock girl was a member of the East Cornwall Hunt Pony Club.
Paying tribute Julia Bassett, of the ECHPC, said Hannah's mother Karen Bragg had requested people to share their memories of her daughter online.
She said: "I am sure by now that most of you will have heard about the tragic and incredibly sad news relating to Hannah Bragg.
"Hannah had been a member of ECHPC for a number of years and was always polite and kind and did well in representing the club in a number of disciplines, most recently by being in team at Lyneham house.
"Hannah was a regular attendee and supporter of rallies with her lovely pony Micky.
"Hannah was awarded the clubs most improved rider award in 2016 for all the hard work she put into producing her pony from The cheeky chap he was when they first joined to the fantastic all rounder he turned into, which was very well deserved.
"I am sure you will all join us in sending our condolences to Hannah's family at this heartbreaking time.
"The club will be sending some flowers, but we feel it appropriate to hold a collection and also to run a fundraiser so a donation can be made to the Cornwall air ambulance service, who attended to Hannah on that fateful day."
Jo Goulden Jones said: "I can't even begin to comprehend how cruel life can be. Lucie and I were both saddened and shocked last night.
"Such a beautiful life to tragically cut short."
Police and paramedics were called to the old viaduct in Tavistock on Saturday after a 14-year-old boy and a 15-year-old girl were found unwell.
Officers say they believe the pair suffered adverse reactions having taken an as of yet unknown substance.
A statement released by Devon and Cornwall police yesterday said: "Officers and ambulance crews were called at around 4.15pm after the 15-year-old girl was found unwell in Crowndale Road [near to the disused viaduct] having believed to have taken an unknown substance.
"The girl, from Tavistock, was taken to Derriford Hospital where she was sadly pronounced deceased. Next of kin have been informed and police are supporting the family at this difficult time.
Officers launched an investigation and believe that both teenagers suffered adverse reactions having taken an as yet unknown substance.
They seized an unknown substance from the scene, which will be tested to establish its exact nature.
Penny Redwood-Smith added: "Absolutely tragic news. Thinking of Karen & family at this sad time. Hopefully in time they can draw some comfort from the wonderful memories we all have of their beautiful daughter."
Chris Hale wrote: "So, so sad, we still can't believe that Hannah has been taken from us all. We took part in many a rally with Hannah. We watched Hannah progress with Micky, a lovely combination and so improved over the cheeky chap that he was.
"A stark reminder that we never know what is around the corner and that life can be snuffed in an instant.
"Our thoughts are with the Bragg family, treasure all your memories of your beautiful Hannah Xxxx"
Police would like to speak to anyone who has information in connection with the incident, including anyone who was in the area around the viaduct/Crowndale Road yesterday afternoon.
Anyone with information which can assist police with their enquiries is asked to contact 101@dc.police.uk or phone 101, quoting log number 655 of 23/06/18.