Agra, June 18 -- The Mathura police arrested the main accused, Sunil Chain aka Sunil Gupta (51), accused in the building collapse case, which left three people dead, on Tuesday. He was charged with culpable homicide and carried a reward of Rs 25,000. The contractor undertaking digging work was also arrested from Mathura city. "Sunil Chain aka Sunil Gupta (51) was arrested along with Pappu (58), the contractor on Tuesday afternoon ," said Kamlesh Singh, the incharge inspector for Govind Nagar police station. According to the complainant, Sunil Chain's digging work at the mud mound on which building stood, led to it collapsing....