VIDEO. Spain: 6,000 migrants from Morocco, an unprecedented situation

Since Monday, May 17, thousands of migrants have flocked to the Spanish enclave of Ceuta, an unprecedented migratory crisis for Spain.

Spain's Interior Minister Fernando Grande-Marlaska announced on Tuesday that around 6,000 migrants entered the enclave illegally on Monday.

He said Spain had already returned 2,700 to Morocco and was continuing these returns.

Prime Minister Pedro Sanchez has promised "the immediate return of all those who entered Ceuta or Melilla irregularly".

Read alsoSpain: 600 migrants forcibly enter the enclave of Ceuta

Diplomatic relations between the two neighboring countries have been strained since the reception, at the end of April, in Spain of the leader of the Saharawi separatists of the Polisario Front, Brahim Ghali, who came for treatment. The conflict in Western Sahara, a former Spanish colony classified as a “non-autonomous territory” by the United Nations, has pitted Morocco against the Polisario, supported by Algeria, for more than 45 years. The Polisario is calling for a self-determination referendum while Rabat is proposing autonomy under its sovereignty.