The New York-based group Human Rights Watch said fighting on the border between Chad and Sudan could put refugees from Darfur at risk.
"If Chadian rebels allied with Khartoum take control of the border region, the refugee camps may be vulnerable to attack from the Sudanese government-backed Janjaweed militia," a Human Rights Watch statement said.
The Janjaweed are accused of atrocities against civilians in Darfur.
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