India successfully tested an upgraded version of its most powerful nuclear-capable missile on Thursday during an army training exercise, a Defence Ministry official said. India and Pakistan regularly test missiles, and normally give each other advance notice for long-range launches. Pakistan was informed ahead of Thursdays test as part of standard practice, ministry spokesman Sitanshu Kar said. The upgraded Agni-I with a 435-mile range was fired from a testing range on an island off the eastern state of Orissa, Kar said. The missile followed the trajectory perfectly and reached the designated spot in the Bay of Bengal, where ships witnessed its detonation, Kar said. The 12-ton missile, developed in India, has an advanced navigation system and can carry payloads of up to 2,200 pounds.