A huge crowd of migrants poured into the Spanish territory of Ceuta overnight, after breaching the country’s border with Morocco. At least 41 died in the process.

The Associated Press reported that the Ceuta government put the number of immigrants who have entered the city from Morocco in the past 24 hours at 60,000.

Ceuta is an autonomous city of Spain located on the northern coast of Africa. It shares its only land border with Morocco and, together with Melilla, another Spanish city, forms the European Union’s only land border with Africa.

This incident occurred a day after Ceuta’s government said between 1,500 and 2,000 people entered in the last 10 days.

Spain’s Prime Minister, Pedro Sanchez, has described the incident as an attack on Spain’s “territorial integrity” while vowing to ensure the safety of Ceuta residents.