The Federal Bureau of Investigation has decided to question Sabahuddin and Fahim Ansari -- the prime accused in the attack on the Central Reserve Police Force camp in Rampur in January last year-- who are currently being probed for their links with the terror attack on Mumbai in November last year.

The FBI will try to glean out crucial information about the working of the Lashkar-e-Tayiba in South Asia by interrogating the duo.

Intelligence Bureau officials told rediff.com that while Ajmal Kasab, the lone terrorist detained for the 26/11 attack, was able to give the FBI details about the LeT's operations in Mumbai, the agency wanted specific information about the terror outfit's network in South Asia.

IB sleuths say that the FBI was hopeful of uncovering details of the nexus between al Qaeda and the LeT by questioning Sabahuddin.

Sabahuddin, the former chief of the LeT's Nepal wing, had access to the top bosses of the outfit. During his interrogation, conducted by police forces from three different states, he has revealed details about the functioning of the LeT and the crucial role played by Pakistan's Inter Services Intelligence.

IB sources also say that the Sabahuddin possesses information about the terror camps run by the LeT and the al Qaeda in Pakistan. IB officials suspect that the two terror outfits work closely and probably assign terror missions to each other's cadres.