Chagai Hills were not the location of Pakistan's Chagai-I nuclear tests of 28 May 1998, which were at the Ras Koh Hills, an entirely different range of hills to the south of Chagai Hills, separated from the Chagai Hills by a large valley. However, confusion may arise because widespread reporting prior to the actual explosion mentioned the Chagai Hills region, and because both the Chagai Hills and the Ras Koh Hills are situated in the Chagai District.