The Pentagon is moving troops to the African nation of Djibouti to prepare for an evacuation of U.S. Embassy staff from Sudan, where fierce fighting between two warring generals has led to the swift deterioration of conditions in the capital, Khartoum, according to two officials.

But senior U.S. officials acknowledged that it would not be easy to get embassy staff out, let alone the estimated 19,000 American citizens who are believed to be in the country.

It remained unclear on Thursday who, if anyone, was in control of Sudan, Africa’s third-largest country. The death toll from the fighting has risen to 330, with nearly 3,200 others wounded, according to the World Health Organization, whose officials said that the figures were an underestimate.

Much of the fighting has occurred in and around Khartoum, including in residential areas and other typically bustling parts of the city. Many residents have been hunkering down in their homes amid the unpredictable bombardments, gun battles and sniper fire that have hit civilian infrastructure such as hospitals.

An uneven cease-fire declared on Wednesday has failed to hold. There have been reports of gunmen breaking into houses and attacking civilians, including a European ambassador. Khartoum’s international airport has been the target of heavy shelling, leaving destroyed planes littering the tarmac, and it is closed to all air traffic.

“The Department of Defense, through U.S. Africa Command, is monitoring the situation in Sudan and conducting prudent planning for various contingencies,” Lt. Col. Phil Ventura, a Pentagon spokesman, said in a statement.

“As part of this, we are deploying additional capabilities nearby in the region for contingency purposes related to securing and potentially facilitating the departure of U.S. Embassy personnel from Sudan, if circumstances require it,” he said.

Japan was the first country to announce a planned evacuation of its citizens. But announcing and actually carrying out the evacuations are two different things; the latter has proved to be elusive. Germany reportedly sent three planes, only to call off the rescue when they were en route.

The U.S. State Department is working with the Pentagon on how best to evacuate both the American Embassy and Americans in Sudan. The department previously said it had no plans for a government-coordinated evacuation, and had urged Americans to shelter in place.