Tributes have been pouring in the for teenager Poppy Rodgers, who is thought to have died after she took a "yellowy white" amphetamine paste.
The 16-year-old York College student was taken to hospital in the early hours of Friday morning, after becoming critically ill on Tang Hall housing estate, to the east of the city. She later died in hospital.
Her former headmaster Carl Sugden described the trainee beauty therapist as a "well-regarded" and "popular" girl to the York Press while family and friends paid tribute on social networking sites.
The teenager's father, Mark Rodgers, is reported to be a research fellow at York University. A friend of the Rodgers family told The Sun "I don’t know whether she was friends with the people at the house or how she got to be there.
"She wasn’t a little tearaway, she was a lovely young girl who was naive."
A 21-year-old man was also taken to hospital after taking the drug paste but is said to be making a recovery.
Following her death, North Yorkshire police warned of the dangers of taking the drug paste thought to have been responsible for the teenager's death.
"People are strongly urged not to risk taking substances matching this description. One girl has already died, and a young man is in a serious but stable condition at hospital, so the potential dangers are very real."
Two people have been arrested on suspicion of supplying the drugs to Rodgers. The 23-year-old man and 26-year old woman have now been released on bail.