Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily  Front Page newsletter and new  audio briefings. Georgia Jones died after taking two pills at the Mutiny Festival in PortsmouthCredit:Facebook His comments on drugs echoed those of Miss Jones’ mother Janine Milburn who revealed her daughter had taken two pills before her death. “If nothing else I hope what has happened to her will deter you from taking anything ever,” she wrote on Facebook.The pair were among 15 revellers admitted to Queen Alexandra Hospital from the event that night, with organisers issuing a warning of a “high strength or bad batch” of drugs. The family of a father who died at a festival along with a teenage girl has criticised security as it was claimed that the pair could have taken super-strength “Green Heineken” ecstasy pills. Tommy Cowan, 20, and 18-year-old Georgia Jones died after falling ill within 20 minutes of each other at Mutiny Festival in Portsmouth on Saturday night.Both of their families have now pleaded that their deaths be a lesson to others.Damian Cowan, 43, said that he had held his son’s hand as he died, adding: “It’s no good saying ‘don’t do drugs’, all I can say is ‘take this on board, look what’s happened, if you want to end up that way, carry on’.”If you don’t, don’t even think about it.”He told Sky News that he had been told that security at the festival this year was “really bad and lax” as he called for tougher checks on those entering events.  The second day of the festival, which Craig David and Sean Paul were due to headline, was cancelled as a “safety precaution”.Witness Sam, 20, said that people at the festival were taking ecstasy tablets nicknamed “Green Heinekens” which were strong. He told the Mirror: “I saw the girl on the ground being treated by paramedics, it was a horrendous sight, she was in a very bad way.“We had not heard anything about any drug warning, but as soon as people started getting ill it was blamed on the Green Heinekens.”The festival organisers said in a statement: “The safety of our amazing customers has always been paramount to us and so to keep everyone safe and in respect to those who have passed, we have taken the decision not to open today…”Enquiries are being made into the circumstances of what has happened, but we must reiterate our advice to all our customers to responsibly dispose of any substances.”A 20-year-old man from Havant, a 20-year-old from Waterlooville, and a 22-year-old man from Cosham are currently being held in custody after being arrested on suspicion of being concerned in the supply of Class A drugs, Hampshire Police said. Georgia Jones died after taking two pills at the Mutiny Festival in Portsmouth Please RT – Please RT – Please RT pic.twitter.com/JjdZpuWYuO— Mutiny Festivals (@MutinyFestivals) May 26, 2018 They were not known to each other and police are not treating the deaths as suspicious, but have since made three arrests in connection with the supply of drugs.