Police have said it is "too early to draw conclusions" about the unexplained death of a 15-year-old girl in Liverpool.
A post-mortem on Rose Farley has been carried out, but officers investigating her death are still awaiting the results of toxicology tests.
Reports have suggested that the teenager spent the evening at a social club party before being taken ill, and may have had her drink spiked.
A 16-year-old boy has been arrested on suspicion of supplying controlled substances as part of the investigation and is being questioned.
Detective Superintendent Tim Keelan, of Merseyside Police , said that it would be counter-productive to speculate on how Rose died.
"The implication that this may be drug-related is just one of the lines of enquiry that our comprehensive investigation is looking at," he said.
"That said I would like to take this opportunity to warn people about the dangers of taking illegal substances.
"The effects of drugs are not always immediately apparent or can be delayed. This can sometimes result in people taking more in order to speed up the effects. This can have devastating results, one of which can be death."
Emergency services were called to the teenager's home in the West Derby area during the early hours of Saturday morning.
She was taken by ambulance to Alder Hey Children's Hospital but died just after 5am.
More than 4,500 Facebook users have viewed a tribute page set up in Rose's memory.
Paisley Bretherton wrote: "r.i.p rose its so sad what happened to u, u had ur whole life ahead off u my thoughts are with your family xx."
Annemarie Taylor added: "thinking of all the family so so sorry to hear your very sad news r.i.p rose life is just so unfair the whole community is absolutely devastated xxxx"
Her death comes just days after Merseyside Police issued a warning about a dangerous ecstasy-type tablet being distributed on the streets of the North West.
Officers have advised people against taking the potentially fatal pink pills, which are know on the street as pink ecstasy, Dr Death or Pink McDonalds.
The warning was issued following the sudden deaths of two men in 24 hours in Cambridgeshire earlier this week. A man also died in similar circumstances in Bournemouth, Dorset, on May 21.