The two linkmen - Sureng Hajoary and Raju Basumatary - arrested yesterday in the district had given information to the abductors on Agarwal, Sonitpur Superintendent Police Arabinda Kalita said.
So far five persons have been arrested in connection with the abduction of the NHPC official, Kalita said.
Assam Director General of Police Jayanta Narayan Chaudhury who recently held a meeting here with the police officials regarding the rescue of Agarwal instructed that the operations be intensified, he added.
Agarwal is originally from Faridabad in Haryana and was posted at Tawang in Arunachal Pradesh for the last one year.
There are two hydro-electric power projects in Tawang - Chu-I and Chu-II. Agarwal is the General Manager of the Chu-I project.