New Delhi, July 30 - The sensational kidnapping and murder of a 16-year-old boy has left several questions about the probe that a top Delhi Police official could not answer.

Investigating officers, for example, were not even aware whether victim Ribhu's father Sanjay Chawla had paid the ransom amount till the death of the child.

'The family only revealed only some information to us,' Joint Commissioner of Police Ajai Kashyap told reporters here Thursday when asked about ransom.

He refused to comment what action police took to save Ribhu, Class 11 student of K.R. Manglam World School in Vikas Puri area, whose body was found Wednesday.

Kashyap even refused to say why policemen were not present when Sanjay Chawla paid the ransom and why a trap was not laid when the abductors came to collect the money. 'I would not like to make any comment,' he said.

The top official remained silent when asked why the phone calls could not be traced when the abductors called Sanjay Chawla several times. Had police managed to trace the location of the abductors through the phone calls, the chances of Ribhu's safe release would have improved.

Kashyap said in defence: 'The probability of the victim's survival is very less when he is known to the abductors, who kill their captive fearing identification and arrest.