article_snippet.sent: But Zane's grieving parents Kye and Nicole Gbangbola have faced a 'wall of silence', leading to claims of a cover-up while public agencies repeatedly insisted the boy died from carbon monoxide poisoning and that there was no risk to the wider public.
article_snippet.sent: The reading was taken at 7.29am – four hours after Zane's mother found Zane unconscious in a bedroom above the hallway and rang 999.
article_snippet.sent: After Zane was found, emergency services had opened doors and windows to ventilate the property for several hours.
article_snippet.sent: Another statement seen by this newspaper says the gas detectors used by the fire service had been tested and certified as working correctly four days before Zane's death.
article_snippet.sent: A spokesman did not answer those questions but said in a statement: 'In February 2014, the post mortem examination into Zane's death proved inconclusive. '