evidence: The South Sudan army seized Heglig Tuesday, claiming that its forces were acting in self-defence because Sudan was using Heglig as a base for attacks on South Sudan. Sudan, however, charges that Heglig is its territory and that it would use "all legitimate means" to win it back, reported the BBC. Sudan announced mobilization of the Sudan army. The African Union said it is "deeply alarmed" and called on both sides to exercise the "utmost restraint," reported Reuters. The AU called on South Sudan to withdraw its troops from Heglig.