In what appeared to be a swift retaliatory action, tribals armed with traditional weapons intercepted, attacked and drove away a survey team of the Vedanta Alumina company even as they were moving towards the Niyamgiri hill top. Ten persons from the VAL were proceeding to the hill top to conduct pre-mining demarcation survey work today when they were intercepted. The survey team escaped unhurt but the armed tribals damaged the vehicle in which they were travelling.