A woman died and a man was in a critical condition in hospital after attending a music festival in Northamptonshire.
Emergency services were called to Illusive Festival, near Corby, on Sunday afternoon to reports of a woman who was seriously ill.
Northampton Police said she later died.
A man in his 20s also became seriously ill, they confirmed.
Officers are investigating a possible illegal substance supply at the festival, while Northamptonshire Combatting Drugs and Alcohol Partnership urged anyone who becomes unwell after taking drugs to seek medical help.
The three-day music festival, which hosted headliners such as Girls Next Door, Lenny D and Ed Solo and marked its tenth year this year, was held in the grounds of stately home, Deene Park.
Det Ch Insp Andrew Tuff, from Northamptonshire Police, said in a statement: ‘We continue to work with those in charge of the festival and colleagues in public health to establish the cause and urge anyone else who feels ill having attended the event to seek medical help.
‘An investigation to establish who may have supplied illegal substances at the festival is underway and I would urge anyone with information that may assist this work to contact us on 101 or via northants.police.uk.’
Jane Bethea, director of public health at North Northamptonshire Council, added: ‘We would always advise against the use of illicit drugs. Nobody can be sure what is in the drugs that they buy, or the effect the drug might have on them.
‘We also advise that if you have taken an illicit drug and feel unwell, that you seek medical help and call 999 if you feel you need urgent medical assistance.’
The festival organisers have been contacted for comment.
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