AGARTALA, August 9: The Union home ministry has asked the Tripura government to make all-out efforts to locate the four Rashtriya Swayamsewak Sangh (RSS) activists who were kidnapped by the National Liberation Front of Twipra (NLFT) rebels from Dhalai district on August 6. Official sources said here that the Union home secretary Kamal Pande had telephoned the state chief secretary V Tulsidas and inquired about the latest developments. The Union minister of state for communication, Kabindra Purakayastha, also had a telephonic talk with the chief minister, Manik Sarkar, who apprised Purakayastha of the state government's initiative to rescue the RSS members.