Police in the North have issued a warning about 'unknown substances', following the death of a man in the Derry area.
An investigation has been launched into the death of the 34-year-old in the Moneymore area, with a post mortem set to take place.
A "possible link to drug or substance abuse" is said to be a strong line of inquiry.
Another 26-year-old man is said to be in a serious condition in hospital.
Detective Chief Inspector Brian Foster said: “Our investigation is at an early stage but we believe that drugs may be a factor in both incidents.
“We also believe that a number of other people may have sought medical attention last night after becoming unwell following the consumption of drugs.
"Our advice is very simple: Do not take illegal drugs; do not take prescription medication that has not been prescribed for you and do not mix either with alcohol. The consequences of ignoring this advice can be life-threatening.
“If you have taken drugs or other substances and are feeling unwell please see medical attention immediately."
Anybody with information about the incident is being used to contact the PSNI.