At least 60,000 migrants have crossed from Morocco into Ceuta, Spain's North African territory, since Thursday, overwhelming the small enclave and prompting Spain's prime minister to call it an attack.
The influx has caused severe shortages of food, water and shelter in Ceuta, one of only two land borders the European Union shares with Africa. According to Ceuta's president, most of the arrivals have already voluntarily returned to Morocco, and officials say more than 25,000 have left. Still, thousands remain in the territory.
More than a dozen migrants died during the journey, which many made by swimming or crossing the border.
Spanish authorities are sending additional law enforcement officers to the area in an effort to control the flow of migrants and restore normality.