The death of a young Feilding man is being investigated to find out whether it was caused by synthetic cannabis.
The 21-year-old died last Thursday after police were called to an address in Warwick St around 9.45pm.
At the same time, a number of others were admitted to Palmerston North Hospital with suspected side effects from synthetic cannabis use.
Police said it was not clear whether the death was due to use of the drug and the matter has been referred to the coroner.
But police and the MidCentral District Health Board have issued a joint warning about the prevalence of synthetic cannabis in Feilding.