FILE - A migrant man sleeps on the ground at a makeshift migrant camp in Bihac, 450 kilometers northwest of Sarajevo, Bosnia, Aug. 14, 2018. Impoverished Bosnia must race against time to secure proper shelters for at least 4,000 migrants and refugees
FILE - A migrant man sleeps on the ground at a makeshift migrant camp in Bihac, 450 kilometers northwest of Sarajevo, Bosnia, Aug. 14, 2018. Impoverished Bosnia must race against time to secure proper shelters for at least 4,000 migrants and refugees

SARAJEVO, BOSNIA - Bosnia should do more to organize shelter for migrants before the arrival of winter, including for hundreds sleeping outdoors in towns near the Croatian
border, the U.N. said Tuesday.

About 15,000 refugees and migrants from Asia and North Africa have passed through Bosnia this year on their way to Europe's wealthier countries.

"The key challenge now is how to prepare for winter," said Stephanie Woldenberg, senior protection officer for the UNHCR refugee agency. "It is the race against time and UNHCR is particularly concerned about vulnerable families and individuals who are most at risk."

Woldenberg, speaking at an event sponsored by the Organization for Security and Cooperation in Europe, said more than 1,000 refugees and migrants were sleeping outside in Bihac and Velika Kladusa, two towns in northwestern Bosnia near the Croatian border.

Several thousand migrants remain in Bosnia after Croatia tightened its borders, and new people arrive daily, crossing illegally from Serbia.

Bosnia's state authorities say they are trying to refurbish inadequate facilities where migrants are currently accommodated but the process has been slow because of a lack of funding and cooperation from local counterparts.

Woldenberg said a priority for the authorities was to protect families with children, single women and unaccompanied minors. "Safe, appropriate accommodation must be provided for these groups as a priority," she said.