Four young kids who ate jelly sweets they believed contained cannabis were taken to hospital after three began vomiting uncontrollably and passed out, say police.
A 12-year-old girl and two boys, one aged 12 and the other 13, suffered "a violent reaction" and were vomiting and falling in and out of consciousness.
Paramedics from the South East Coast Ambulance Service began treating the three children when they were called to a parade of shops in Epsom, Surrey, just after 2pm on Saturday.
Those three were taken to hospital by ambulance while a fourth child - a 12-year-old boy - was taken to hospital by his family as a precaution because he is also believed to have eaten the sweets.
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All four children were expected to remain in hospital overnight for observation.
It is believed the sweets may have been supplied to the children at the nearby Court Recreation Ground.
Police do not have a clear description of the sweets involved, although a similar report from Friday night involved "jelly apple rings" which resemble green jelly circles.
Detective Sergeant Lee Marks, of Surrey Police, said: "We are, of course, trying to understand what these sweets are, where they came from and what they contain.
"However, our immediate priority is to warn parents and to tell children in the area not to be tempted to try them as they are obviously causing substantial harm.
"These types of products, which may be marketed as 'cannabis infused' or 'CBD infused' are illegal, and therefore unregulated, in the UK.
"They can appear to be commercial products with professional packaging, but this should not be taken as a sign that they are safe or legal."
A spokesperson said: "Surrey Police is asking parents in Epsom to urgently speak to their children about the dangers of 'edibles' after two 12-year-olds - one boy, one girl - and a 13-year-old boy were taken to hospital after suffering a violent reaction from eating jelly sweets that they believed contained cannabis.
"A fourth 12-year-old boy has been taken to hospital by his family as a precaution, as he is also believed to have eaten the sweets.
"We were called at 2.15 today by the South East Coast Ambulance service to the parade of shops on Pound Lane. Epsom, close to Court Recreation Ground, where three children were vomiting uncontrollably and falling in and out of consciousness.
"They were taken to hospital by ambulance, and all four children will remain in hospital overnight for observation."
The spokesperson added: "At the moment we do not have a clear description of the sweets involved, however we have had a similar report from last night in the local area involving 'jelly apple rings' which appear as green jelly circles.
"The individual in that incident was thankfully less affected.
"There is a suggestion that the sweets may have been supplied to the children at the Court Recreation Ground."
Anyone who is concerned about the health of someone that they believe may have taken these products is asked to call NHS 111 or 999 in an emergency.
Police say anyone with information about the supply of the sweets or who has found similar sweets or related packaging in the area is asked not to destroy them but to contact the force through the chat on its website, quoting reference PR/P21090934.
People can also call Surrey Police on 101 or, in an emergency, ring 999.
It came as three people died in Newcastle in just 24 hours after they were thought to have taken a "particularly dangerous or toxic" batch of the hallucinogenic and highly addictive drug Spice.
The deaths occurred on Friday and Saturday, the local council said as it urged people not to consume Spice or any other drugs.
