Indian Mujahideen leader Yasin Bhatkal and his associate Asadulla Akhtar alias Haddi were handed over by Delhi court to the National Investigation Agency (NIA) for 12 days.
Bhatkal, Akhtar and NIA officials took off from the Jai Prakash Narayan International Airport, Patna at 12.38pm, and landed in late afternoon.
Earlier, the duo with their faces covered was brought to the airport from the BMP camp under tight security arrangements.
A small group of people raised slogans at the airport demanding capital punishment to Bhatkal and his associate.
The NIA had on Thursday obtained a three-day transit remand of Bhatkal and his associate from a Motihari court.
The two, who were brought to Patna from Motihari by road last night, were kept at the Bihar Military Police (BMP) campus near the Airport.
NIA officials interrogated Bhatkal and Akhtar at BMP office again on Friday morning before taking them to national capital.
The top IM operative has confessed to his links with the Pakistan’s premier spy agency Inter Services Intelligence, which has been accused of sponsoring terror attacks against India, a news channel reported.
A joint team of Bihar police and NIA had arrested Bhatkal and Akhtar, carrying a reward of Rs. 10 lakh each, from Nahar chowk in Raxual along Indo-Nepal border, around 225 km from the capital town of Patna, on Wednesday.