TESTS to discover how a 13-year-old boy died suddenly on Monday evening have proved inconclusive.
Mason Douglass died unexpectedly at his home in Acklam.
A post mortem hold today (Thursday, October 8) has not given any further explanation of how the "bright and wonderful" Acklam Grange pupil died.
Cleveland Police said further tests would now be carried out - and they are expected to take several weeks to complete.
A spokeswoman said: "The death is still being treated as unexplained at this time."
Emergency services were called out to Mason's house in Bank Sands after reports the youngster had gone into cardiac arrest. He was treated by a Great North Air Ambulance doctor, and taken to hospital by road ambulance, but died.
His head teacher Andrea Crawshaw said: "Mason was an excellent, bright, wonderful young man who is a credit to Acklam Grange School."
Students and staff are being supported by trained bereavement counsellors.
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