A 23-year-old software engineer, Aravind, was killed and three others injured in a commercial gas cylinder explosion at a paying guest accommodation in Bengaluru's Kundalahalli on Monday evening. The blast occurred at the Seven Hills Sai Co-Living PG, a seven-storey building with 43 rooms. Preliminary investigations suggest a gas leak and potential negligence by the PG owner and manager, who have been booked. The injured are in stable condition at Brookfield Hospital.