The Biden administration on Wednesday began notifying governors and state refugee coordinators across the country about how many Afghan evacuees from among the first group of nearly 37,000 arrivals are slated to be resettled in their states.

The U.S. has halted all U.S.-bound flights of Afghan evacuees from two main bases overseas after discovering a limited measles outbreak among Afghans arriving in the United States, a hitch that American officials warned will have a severe impact on an often-troubled U.S.-run evacuation.

At least 50,000 Afghans are expected to be admitted into the United States following the fall of Kabul as part of an “enduring commitment” to help people who aided the American war effort and others who are particularly vulnerable under Taliban rule, the secretary of homeland security said Friday.

Addressing the nation, a defensive President Joe Biden on Tuesday called the U.S. military airlift to extract more than 120,000 Afghans, Americans and other allies to end a 20-year war an “extraordinary success,” though thousands of people looking to leave remain.

Two suicide bombers and gunmen attacked crowds of Afghans flocking to Kabul’s airport Thursday, transforming a scene of desperation into one of horror in the waning days of an airlift for those fleeing the Taliban takeover.

A firefight outside Kabul’s international airport killed an Afghan soldier early Monday, highlighting the perils of evacuation efforts as the Taliban warned that any attempt by U.S. troops to delay their withdrawal to give people more time to flee would “provoke a reaction.”