At least three people were killed after a powerful petrol bomb exploded in the administration area in the Nepali capital Kathmandu Monday afternoon. Two of them died on the spot while the third died at a local hospital. More than six people were injured and five of them were said to be in very critical condition at Bir Hospital in the capital. The three deceased are a senior lady and two men. It has not been clear who are responsible for the explosion. Investigation into the incident is underway. Police have cordoned off the site.