With Pakistan saying it needs more information on Mumbai attacks to pursue probe, India on Tuesday criticised it for talking through the media and asked it to seek officially whatever it wants.
New Delhi made it clear that it will not "negotiate" through the media and reminded Islamabad about the official channels of communication which should be used.
"We would expect official communication from Pakistan whether they need anything extra and anything additional from us," External Affairs Minister Pranab Mukherjee told reporters in New Delhi.
He was responding when asked about Pakistan saying it would require more information from India in connection with the Mumbai attacks, as the dossier provided earlier was not substantial.
"They (Pakistan) should communicate officially, then we will be in a position to deal with it, otherwise it is going to be extremely difficult," Mukherjee said.
Earlier, Foreign Secretary Shivshankar Menon refused to comment on Islamabad's contention, saying Pakistan has been "saying various things at various times and in various forms to various audiences".
"If they (Pakistan) have something to say to us, they should come and directly talk to us," Menon told reporters last night while returning from Dhaka where he had gone with Mukherjee.
Menon said India will not react to "statements to the media, different statements through different people, through speculation and through guesswork".
New Delhi is unhappy with Islamabad's attitude over the Mumbai dossier since the beginning as it feels the neighbouring country is trying to drag the matter and avoid coming clean on the issue.
Sources in the Ministry of External Affairs noted that the dossier provided by India was quite comprehensive, containing lot of details about linkages in Pakistan to the Mumbai attacks.
The dossier has identified individuals who were in touch with the Mumbai attackers, their phone numbers and other details.
"We are not going to negotiate with Pakistan through media on the Mumbai terror attacks issue. That is precisely India's stand. We have offered a dossier based on the pain-stalking and comprehensive investigations," a source said.