A Gaya Railway Police officer, Rajesh Kumar Singh, who was investigating a Rs 1.44 crore gold heist on the Howrah-Bikaner Express in November, has been arrested for alleged involvement. The theft involved four men in police uniform who looted gold biscuits from a trader's employee. Investigations, including analysis of call detail records, led to Singh's arrest. Authorities are now searching for other absconding personnel implicated in the crime and attempting to recover the stolen gold.