A sub-contractor has been arrested after a biker fell to his death in a pool-sized pit dug by the Delhi Jal Board (DJB) in Janakpuri, officials said Saturday. A probe revealed that the sub-contractor, Rajesh Prajapati, was allegedly alerted about the accident hours before police received information about it, but he failed to take any action, officials said. Twenty five-year-old Kamal Dhyani, a resident of Kailashpuri and an employee of a private bank, was returning home late Thursday night from his workplace in Rohini when he fell into the deep pit and died. His body, along with his motorcycle, was found inside the ditch the next morning. A family passing through the area the previous night had noticed that the victim had fallen into the pit. They immediately alerted a security guard deployed at the site. The security guard informed a junior staff member the same night, stating that a person had fallen into the pit, police said. The junior staff member then called Praj...