The Sri Lankan student was freed on bail last month after the sole piece of evidence against him fell apart. The plan, detailed in a notebook found inside Nizamdee’s desk at the University of NSW, was to allegedly target iconic Sydney land marks and high-profile Australians including former Prime Minister Malcolm Turnbull and former Foreign Minister Julie Bishop. According to experts the notebook was not written in Nizamdeen’s handwriting.On Friday NSW police said despite dropping all charges they were refusing to close the case because the question over who did write it remains. “It’s a terrible experience, as a young man who has done everything right in life, he has gone through supermax jail in unforgivable circumstances,” Kheir said.The student who has claimed his innocence since he was first arrested in August, uploaded a video on social media shortly after he was released from prison last month.“Thank you very much to the Sri Lankan public and officers for standing by me and believing that I’m innocent, which I am,” Nizamdeen said. The student’s lawyer Moustafa Kheir told reporters outside court on Friday that the entire ordeal was “unforgivable” and his client would be suing the state over the bungle Now, police are investigating whether the 25-year-old was framed and believe the brother of a high-profile Australian sportsperson may have been involved.Ten News has chosen not to reveal the identity of the sportsperson at this time.“We believed we had enough evidence at that time to effect an arrest in relation to this matter… right through the investigation we have acted in good faith,” said Assistant Commissioner Ian McCartney earlier on Friday. The brother of a prominent Australian sportsperson may have been involved in setting up a 25-year-old Sri Lankan student over an alleged Sydney terror plot, Ten News reported.Charges against Mohamed Kamer Nilar Nizamdeen were formally dropped by NSW police on Friday after the 25-year-old spent 40 days in a supermax jail accused of concocting an ISIS-inspired terror plot.