IMPHAL, August 23: CDO Imphal east arrested one PREPAK (PRO) cadre namely, Sapam Robin Singh alias Bacha, 40, son of S. Tombi Singh of Singjamei Sapam Leikai from Minuthong Junction and one mobile phone with Airtel SIM was recovered from his possession. On verification, he disclosed that he joined PREPAK (PRO) organization in the month of February 2012 through one Sapam Lamyanba of Bashikhong and he was involved in extortion of money from the general public, government officials and private firms etc., a release of the Superintendent of Police, Imphal east district, Manipur.