Sea and air borders in the region are strongly contested.
Officials in Nigeria say that they are trying to control that risk by screening at land, sea and air borders.
Burkina Faso's land and air borders were closed and a 7 pm to 6 am curfew was imposed.
Amadou Sanogo, appeared briefly to announce that a curfew was in force, and the junta members ordered Mali's land and air borders closed.
President Bush said today that he would propose spending $11 billion next year to protect the United States' land, sea and air borders from terrorist attacks.
One Swedish woman who works for the UN has been killed, apparently by a stray bullet.Update: Mr Ouattara has apparently ordered that air borders be re-opened, though land and sea borders remained sealed.
But he and Mustafa Abdel Jalil, the council's avuncular chairman, promise to resign once Sirte is captured: at that point all of Libya's land, sea and air borders will have come under the new authorities' control.
In case Romania's gets green light, it might join the Schengen bloc in a two-step admission procedure suggested by France and Germany: sea and air borders in the first phase and land borders afterwards.Schengen is not the only big issue Romania is facing this year.
Kenya's ban on people from Guinea, Liberia and Sierra Leone entering the East African nation comes into force on Wednesday - and Cameroon has closed its land, sea and air borders with Nigeria.
The leaders have also named Gilbert Diendere, a general in the elite presidential guard, to head a transitional council, the soldiers said in a statement broadcast on state-run television on Thursday, which also announced the closure of the nation's land and air borders, as well as the implementation of an overnight curfew.
