A Punjab Police sub-inspector was arrested for allegedly accepting a bribe of Rs 50,000, the state vigilance bureau said on Saturday.The accused, Mewa Singh, was posted at the cyber cell in Sangrur. A resident of Kothe Maha Singh Wala village in Bathinda had lodged a complaint against him, a bureau spokesperson said.A case had been registered at the cyber cell of Sangur police station against the complainant and his wife, and Singh was the investigating officer. The complainant alleged that the sub-inspector demanded Rs 50,000 to help secure his wife’s discharge from the case.Following the complaint, the bureau conducted a preliminary inquiry and laid a trap. Singh was allegedly caught red-handed while accepting the bribe in the presence of two official witnesses, the spokesperson said.A case under the Prevention of Corruption Act has been registered against Singh, he added.