Zaibuddin is being interrogated by law enforcement agencies and the ministry does not want its investigations hampered in any manner by sharing such information with Pakistan.
The sources said that Zabiuddin, an Indian national, holds a Pakistani passport and two Pakistani identity cards. "This indicates Pakistan's complicity," a source said.
Zabiuddin, a key handler of 26/11 attackers, was arrested on June 21 on his arrival from Saudi Arabia.
Home Minister P Chidambaram had yesterday said there was clearly Pakistani state support to the terrorists responsible for the 26/11 attack.
His comments had evoked sharp reaction from Pakistan's Interior Ministry chief Rehman Malik who after rejecting Chidambaram's assertion of "state support" to the terrorists said that ISI was a target of "propaganda campaign".
Chidambaram had stated that the Indian security agencies have been tracking Jundal, Lashkar-e-Taiba operative, for nearly a year and the information was kept a "well guarded secret".