new delhi india step security along largely porous eastern border bangladesh use chilli stun grenades block entry rohingya muslims flee violence homeland myanmar officials say friday border force hindu-majority india want deport around 40,000 rohingya already live country cite security risk authorize use rude crude methods stop infiltration attempt want cause serious injury arrest tolerate rohingya indian soil say senior official border security force bsf new delhi use grenades contain chilli spray stop hundreds rohingyas try enter india ... situation tense add official decline identify authorize speak media 420,000 rohingya flee bangladesh since aug. 25 coordinate attack rohingya insurgents myanmar security force trigger counteroffensive kill least 400 people mainly militants unite nations call assault textbook example ethnic cleanse densely populate bangladesh struggle shelter refugees desperate space set shack spark worry india influx could spill territory r.p.s jaswal deputy inspector general bsf patrol large part border india eastern state west bengal say troop tell use chilli grenades stun grenades push back rohingya chilli grenade make use naturally-occurring compound chilli powder cause severe irritation temporarily immobilize target prime minister narendra modi hindu nationalist government grow increasingly hostile towards rohingya india home minister rajnath singh call thursday deportation illegal migrants seek get legal clearance deportation plan home ministry tell supreme court week would confidentially provide intelligence information show rohingya link pakistan-based militants peaceloving refugees link criminal activity two rohingya men protest deportation move tell india top court friday official india federal investigations agency say seek help muslim religious leaders step surveillance rohingya police arrest suspect al qaeda member believe try recruit rohingya country fight security force myanmar 270 rohingya indian jail since 2014. investigations reveal al qaeda want use india bangladesh base start religious war myanmar say new delhi police official pramod singh khuswah clearly threat security india use chilli spray stun grenades dissuade rohingya influx