Thousands of people crossed from Morocco into Spain's North African enclave of Ceuta in a single day, overwhelming border police and sparking a major crisis for Spain and the European Union. Spanish authorities reported at least 34 deaths during the crossings, while local media and rights groups put the toll at 18. The influx was so large that Spanish police lost control of the border, and the head of Ceuta's city government estimated that about 60,000 people had entered. Many migrants arrived by land, while others swam or used small boats. More than 37,500 have since returned to Morocco, authorities said. The mass movement triggered clashes in the Moroccan border town of Bni Nsar, where migrants threw rocks at police and set police vehicles on fire. Spanish Prime Minister Pedro Sanchez blamed criminal networks for the influx, though the immediate cause remained unclear. The European Union moved to contain the crisis on Friday, amid diplomatic tensions across the bloc. The unrest continued into a second day as authorities worked to restore order.