The EU has further delayed the deployment of some 3,700 peacekeepers to Chad because of recent fighting in the capital, N'Djamena.
The force's commander told the BBC his troops would not be deployed for at least another four weeks.
Meanwhile, normality has returned to N'Djamena after the authorities relaxed a curfew, a BBC correspondent says.
However, aid agencies say Chadian Rebels Seize Capital as EU Plots Next Move ...
French jail terms for Chad kidnap ...
Chad Agrees to Repatriate Convicted French Aid Workers ... they are still struggling to cope with large numbers of displaced people.
Some 30,000 Chadians fled across the border into neighbouring Cameroon after rebels attacked N'Djamena last weekend.
The French-dominated EU peacekeeping force had been due to start deploying to Chad at the beginning of February to give the refugees and aid workers there a measure of protection, but the rebel offensive began at the same time.
Many of refugees have now converged on the border town of Kousseri, which is full to bursting point, the BBC's Arnaud Zajtman in N'Djamena says.
The United Nations in Geneva says worsening security in Chad has also resulted in serious shortages of supplies for Sudanese refugees in eastern Chad.
(BBC)
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