Chad is withdrawing it troops from neighbouring Niger, where they were helping local forces to fight Islamist militants, Boko Haram. humanitarian sources said.
The withdrawal over the past few days could weaken a region-wide struggle against the militants who have killed tens of thousands of people, forced many more to flee and triggered a humanitarian crisis.
There was no immediate explanation or comment from defense officials in Chad.
The move came after U.S. imposed a travel ban imposed on its nationals.