evidence: Spain has been left scrambling to secure its borders after thousands of migrants entered Ceuta, one of two Spanish enclaves on the northern coast of Morocco this week. Around 8,000 migrants, including families, are reported to have entered Ceuta on Monday and Tuesday, many entering the territory by swimming around border fences in the sea that separate the enclave from Morocco, as well as reports of migrants using inflatables and dinghies. At least one person was reported to have died during the crossing. [...] Ceuta and Melilla have been under Spanish rule since the 17th century, although Morocco has claimed the territories as its own since its independence in 1956. Some believe that the current tension between Spain and Morocco stems from Spain accepting Brahim Ghali, the leader of Western Sahara's Polisario Front, which wants independence from Moroccan administration for Western Sahara, to be admitted to a hospital in Spain for treatment last month, angering Rabat.