A teenager was left in a life-threatening condition and two others critically ill after taking what are thought to have been 'legal highs'.
The 15-year-olds were rushed to hospital after they were discovered in Queen Elizabeth Gardens, in Salisbury.
All three boys are now recovering.
A man who died and three others were taken to hospital may have used the same legal high police have said.
Officers are investigating after a 49-year-old man was found unresponsive in St James Park, Bristol, and subsequently died, while three other men were taken to hospital after falling ill at two other locations.
Police say there maybe a link between the incidents and are warning the public to avoid the drugs or risk playing "Russian roulette" with their health.
It's thought they may have taken a legal high commonly referred to as Spice.
Legal highs, or New Psychoactive Substance (NPS), are often sold as plant food, incense or research chemicals and are sometimes labelled 'not fit for human consumption'.
A Plymouth shop that sold so called 'legal highs' is to stay closed for the next three months after the police and council won a Closure Order at court.
The move is the first of its kind in the city and will see the 'High Life' shop keep its shutters down until September.
Meanwhile the owners of another store, that was also shut temporarily under new anti-social behaviour legislation, have vowed to contest the closure order. John Andrews reports:
A court hearing seeking the closure of two Plymouth shops selling legal highs may be postponed.
The shops have been closed temporarily under a new anti-social behaviour law. Plymouth council and Devon and Cornwall Police planned to seek a permanent order in the magistrates court today.
One shop owner says he intends to fight the case and it may now be put back to July.
Two shops selling so-called legal highs in Plymouth have been shut.
The police have been granted a temporary closure notice under new anti-social behaviour legislation, and have acted with the City Council against the stores, High Life store, in the centre of Plymouth, and Dam Good Head in Ebrington Street.
An application for a permanent closure order will be heard by city magistrates tomorrow.
Taunton Deane has become one of the first councils in the country to ban using legal highs in public.
A Public Space Protection Order banning the use of "intoxicating substances" in public comes into force today (June 1st).
The council says it received "overwhelmingly positive" views when the public was asked about this in April.
Recent changes to the law mean local councils can now place an order like this on activities they believe are "having a detrimental effect on the quality of life for people in the community".
The order prohibits drinking, using legal highs or using any other substances "with the capacity to stimulate or depress the central nervous system" in public areas.
It replaces a "no drinking" order that applied to some areas of Taunton, and is much broader, covering Taunton town centre and areas around Priorswood Road, through to Toneway and Blackbrook Way.
Breaching the order will be a criminal offence, and offenders could be fined in court or received a fixed penalty notice. Police and council enforcement officers will have the power to demand people hand over any prohibited substances.
A judge has dismissed an appeal from the owners of a legal high shop in Taunton for their closure order to be overturned.
Judge Graham Cottle said he heard from police how anti-social behaviour in the town had plummeted since the order was made, and called it “demonstrably necessary".
Hush, in Bridge Street, was ordered to close by magistrates after complaints from nearby residents and traders. The order can be extended for a maximum of three months.
Police in Taunton have set up a dedicated phone-line to find out if the closure of a shop selling legal highs has reduced anti-social behaviour in the town.
Hush, in Bridge Street, was ordered to close by magistrates for three months after complaints from nearby residents and traders.
Officers are asking people to ring 01823 363 185 with their feedback.