Police sources said they will ask the Board to get the bone density test done as fast as possible to determine the age of the accused.
The boy had claimed using his school certificate that he is 17-year-old. However, police have refused to take the claim and sought for an ossification test to determine his age.
He was among the six persons arrested in connection with the December 16 gangrape and brutal assault of the 23-year old physiotherapy student in a moving bus in south Delhi. She died during treatment in Singapore on December 29.
Sources said the test has not been done and a fresh request has been sent to the Board to get the test conducted.
Police have filed the charge sheet against the five remaining persons allegedly involved in the case in a court here.
Sources said if a bone test certifies that the boy is not a minor and he is above 18 years, then a supplementary charge sheet will be filed.
If the boy is a minor, police will file a report in the Board following which proceedings will be initiated in the case.
Police sources said investigators fine-tuned the charge sheet till late last night to ensure that the document is foolproof.
