Chad says it is in "a state of war" with neighbor Sudan, which is accused of aiding Chadian rebels trying to overthrow President Idriss Deby.
Chad accused Sudan of being the "common enemy of the nation" after a Chadian rebel attack on a town last week in which about 100 died, the BBC reports.
The government called on Chadians to mobilize against what it called Sudanese aggression. Its strong language comes after observers had warned tensions along the Chad-Sudan border were nearing breaking point.
"Chad is today in a state of war with Sudan," the latest government statement said.
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