Lahore, Mar 8 : Pakistan's Federal Investigation Agency fears it may have to stop further investigations into the 2008 Mumbai terror attacks due to a lack of cooperation from India and other countries.

A private television channel said the concerns were expressed in a letter addressed to the Interior Ministry.

The FIA, which is probing the Mumbai terror attacks, has informed the Interior Ministry that it would have custody of some suspects only for a few more days and it was thus imperative to get cooperation from other countries.

The FIA said it "may have to stop further investigations" against the suspects due to the lack of cooperation by India and other countries, sources said.

The agency said it had not received a charge sheet against arrested attacker Ajmal Kasab from the Mumbai Police and that agencies from the US, Spain, UAE, Kuwait and Saudi Arabia have also not responded to requests for information. (ANI)