Police have warned teenagers against taking Ecstasy after a 14-year-old girl died in Scarborough.
Officers were called to a report that a girl had become unwell at an address in the North Marine Road area at about 4pm on Wednesday.
They found two girls aged 13 and 14 at the property and both were rushed to hospital.
North Yorkshire Police said the older girl was pronounced dead a short time later at hospital.
The 13-year-old remained in hospital and her condition was not believed to be life-threatening.
Two teenage boys were arrested by police on suspicion of offences involving the supply of Class A drugs.
One was released under investigation while the other remained in custody.
Detective Chief Inspector Graeme Wright, of North Yorkshire Police, said: "First and foremost, our thoughts are with the family and friends of the young girl who died as a result of this tragic event, and of all those affected by it.
"Extensive police enquiries are ongoing to determine the events around her death.
"Although our investigation is at an early stage, I would urge anyone who has acquired MDMA or other illegal drugs recently not to take them.
"If you have taken such a drug and feel unwell, it is vital that you seek medical help immediately.
"This is clearly a devastating incident and I would ask everyone to respect the privacy of the families involved, and refrain from speculating about this incident online."
Anyone with information is asked to call 101.
