MUMBAI, Jan. 6 -- An investigation into a stray firing incident due to a domestic dispute in Vasai East took a serious turn when the police found firearms and a hand grenade at the accused's house in Mumbra. After he was arrested and interrogated on Sunday, the Maharashtra Anti-Terrorism Squad (ATS) sent two teams to Uttar Pradesh to trace the seller of the arms and explosives. According to the police, the incident occurred on Friday early morning when Shivshankar Vishwakarma, 42, fired a bullet at his sister, Pushpa's house in Waghral Pada, Vasai East. No family member was injured as they were sleeping on the floor, and the bullet struck the window. After the incident, Pushpa approached the Waliv police, complaining against him. Based on CCTV footage and other evidence, the police confirmed the accused as Vishwakarma and traced him to Diwa, where he was arrested on Sunday morning. The police then searched his house in Mumbra and recovered two country-made revolvers, several live cartridges, and a live hand grenade. The case was then referred to the ATS. Acting on the information, the ATS has begun parallel investigations to identify the supply network and possible links to organised arms trafficking. He was produced before a local court and remanded in police custody till January 12. The police said that during interrogation, Vishwakarma revealed that the weapons had been procured from a seller in Uttar Pradesh, after which the ATS sent two teams to Uttar Pradesh to hunt down the dealer, said a police officer. The police's investigation has revealed that the firing was triggered by a long-running family dispute. Pushpa, had mortgaged her jewellery and borrowed around Rs.1 lakh from private lenders to secure funds for his bail in 2025, after he promised to repay the amount by selling land in his native village. However, after his release, he failed to keep the promise, and tensions escalated as money lenders demanded the payment of installments. Angered by his sister's repeated demands, Vishwakarma allegedly moved out and started living in Mumbra. He then planned and fired at her house on Friday morning, said a police officer. "Vishwakarma has a criminal past and was arrested in 2018 for murdering his wife, Chandrakala. He stabbed her to death at their Ghatkopar home following a domestic altercation," the police said. According to the police, the incident occurred on June 2, 2018, at around 6.45 am at their then residence in Ramabai Colony in Ghatkopar, when an argument broke out between Vishwakarma and his wife, Chandrakala. In a fit of rage, he picked a knife from their kitchen and attacked her in the throat, and then stabbed himself in the stomach. The neighbours, who heard loud voices, rushed to their flat and found the couple bleeding. They were rushed to Rajawadi Hospital in Ghatkopar, where Chandrakala was declared dead. Subsequently, the police arrested Vishwakarma after he was discharged from the hospital....