BANKA, Jan. 9 -- A police sub-inspector (SI) was crushed to death by a speeding truck while discharging his duty in Bihar's Banka district late Wednesday night, police said. The incident occurred at Dhoraiya Chowk under the Panjwara police station area. The deceased was identified as Purendra Kumar Singh, a resident of Munger. His family members live in Deoghar district of Jharkhand. Superintendent of Police (SP) Upendra Nath Verma, who rushed to the spot, said the SI was checking vehicles along with other security personnel when a speeding truck hit him after he signalled the driver to stop. "He was immediately rushed to hospital but was declared dead," the SP said. Both the driver and the cleaner of the truck have been arrested, the SP further said....