TINSUKIA Aug 18: The phenomenon of witchery, though prevalent in certain pockets particularly among Adivasis of tea tribe communities inhabiting in Sonitpur and Baksa districts, this social evil of late has engulfed Tinsukia district after a couple was lynched for being suspected to be practising witchcraft at Raidang TE under Doomdooma PS in Tinsukia district on intervening night of Tuesday. Though police arrested 31 people for gruesome act the following day, the incident has shocked the district even as various organisations at different forum carried out mass awareness programme against the mece of witch hunting, superstition, black magic and sorcery in recent times.