Two young people thought to have died after taking drugs in the run-up to Christmas have been named. Charlotte Woodiwiss, 20, from Chapel-en-le-Frith in Derbyshire, was found dead at a flat in her home village on 22 December.
Dale Yates, 18, from Buxton in Derbyshire, was found dead at a flat on Eagle Parade in the town on 23 December.
Eleven people have been arrested on suspicion of drugs offences and bailed.
Four of those, three men and a woman from the Chapel-en-le-Frith area, were arrested on suspicion of supplying class A drugs.
Police said the deaths were not thought to be linked to each other and the two young people were not thought to have known each other.
In a blog post on 20 December Ms Woodiwiss said she was studying art and in the last year of her degree course.
'Drugs and alcohol'
Steve Holme, from Derbyshire Constabulary's drugs unit, said the young people had both been at locations where drugs were used.
"We know that both had probably used a combination of drugs as well as alcohol and we're awaiting toxicology tests to be sure," he said.
Officers warned people about the dangers of mis-using drugs.
Insp Martin Coey said: "We don't yet know the cause of these young people's deaths but we don't want anyone else to die if we can prevent it.
"Anyone who takes drugs needs to be aware that there is no guarantee that the drug is what they think it is. "Illegal drugs and so-called legal highs can have different strengths and have different components. All drugs can be dangerous and people who use them should not mix them with alcohol."
2 January 2013 Last updated at 10:03 ET
Dear Drugs-Forum readers: We are a small non-profit that runs one of the most read drug information & addiction help websites in the world. We serve over 4 million readers per month, and have costs like all popular websites: servers, hosting, licenses and software. To protect our independence we do not run ads. We take no government funds. We run on donations which average $25. If everyone reading this would donate $5 then this fund raiser would be done in an hour. If Drugs-Forum is useful to you, take one minute to keep it online another year by donating whatever you can today. Donations are currently not sufficient to pay our bills and keep the site up. Your help is most welcome. Thank you.