As per a complaint by Kalyan Singh, on August 1, two policemen Ummed Singh and Nitin Kumar and another sub- inspector took his son Pratap Singh from his house, Additional Superintendent of Police Kamlesh Dixit said.
Kalyan alleged that Pratap was found hanging from a hook the next day, he said.
On the basis of the complaint, an FIR was lodged last night against the trio, the ASP said.