"Some syringes found were found in the athletes' village and we are continuing to investigate the nature of why those syringes were found and if anything is behind this", he said.
Australian swimmer Mack Horton, who caused a sensation at the 2016 Rio Olympics by slamming China's seven-time world champion Sun Yang, said if any athletes are caught cheating they deserved punishment.
Grevemberg would not reveal which nation was involved, denying reports from The Times of India that the syringes were found where the Indian team was staying.
The Indian team denied any wrongdoing or that the syringes were even in their rooms.
Physically Challenged Sportsmen and women have specially boosted Nigeria's medal hauls in the past and the VCN management is emphatic that a more radical exposure and development of the athletes would make Nigeria take a leading role in Special Sports globally. "It does not belong to us", an Indian official, travelling with the contingent, told PTI.
"It's the Indian contingent's doctors who handed over the syringes to the medical commission and they disposed them off".
Few Indians were supposed to attend dope tests but the official said it was under usual routine and not connected to the syringe incident.
Under CGF rules there is a strict "no-needles" policy in the athletes' village during the competition with the exception of approved medical practitioners or those with an "auto-injecting" condition such as diabetes.
Any athlete proven to have taken a banned substance would be thrown out of the Games. "Because the measures that have come in for drug-testing means these will be the cleanest Games, they'll be friendly Games and at the end of it our reputation globally will be restored", he explained.