Four policemen have been arrested for allegedly robbing a jeweller under the pretext of a checking drive on a highway in Uttar Pradesh's Gorakhpur. Sub-inspector Dharmendra Yadav and three other constables posted at the same police station in Basti have been identified as the accused. The jeweller and his assistant had taken a bus from Gorakhpur to Lucknow on Wednesday. The cops stopped the bus and asked the two to come down. They were then taken to an isolated spot and robbed. The Gorakhpur police said they have recovered ₹ 19 lakh in cash; gold and silver worth ₹ 16 lakh and a car used in the crime. Two informants who helped the policemen track the jeweller before making their move have also been arrested, the Gorakhpur police said.