Nearly 6.5 million people have been displaced inside Ukraine amid the Russian invasion, according to a report from the United Nations migration agency and other international bodies released Friday, in addition to the more than 3.2 million who have fled the country.

    The report on internal displacements in Ukraine also noted that over 12 million people are estimated to be stranded in affected areas or unable to leave due to security risks or destruction that has caused roads to be blocked.

    Displaced Ukrainians have sought refuge in metro stations, sports arenas and movie theaters. Amid the ongoing siege of Mariupol, Ukraine, a city populated by hundreds of thousands, Russia earlier this week bombed the Mariupol Drama Theatre, where hundreds of people — including pregnant women and children — were taking shelter. 

    To facilitate the evacuation of Ukrainians, Ukrainian and Russian officials have agreed to establish humanitarian corridors, or protected pathways, so people can safely leave dangerous areas. However, Ukrainian officials have accused Russian forces of continuing their attacks along these routes, making it harder for Ukrainians to flee.

    Ukrainians are also being cut off from resources. According to a Humanitarian Impact Report released Thursday by the U.N. Office for the Coordination of Humanitarian Affairs, amid the ongoing attacks in Rubizhne, Ukraine, 35,000 users have been cut off from gas supplies and 104,000 remain without electricity. 

    The U.N. is also concerned that the high number of displaced people forced to shelter in crowded places with limited sanitation facilities and access to health care services will allow for more transmission of COVID-19. The prevalence of HIV and tuberculosis in Ukraine have also raised concern.