Spain on Saturday installed a 500-meter-long (1,600-foot) barrier on the sea border between its North African territory of Ceuta and neighboring Morocco after tens of thousands of migrants breached the frontier earlier in the week.

At least 67 migrants died, including some who drowned and others who were killed in a stampede to cross a breakwater barrier, the Spanish government said Saturday.

Spanish Prime Minister Pedro Sánchez slammed the reaction of some other European Union leaders to the events in Ceuta, saying calls for Spain to be suspended from the EU’s borderless Schengen zone were “driven by prejudice, fake news, ignorance, or political interest.”

A handful of exhausted migrants who swam to Ceuta’s urban Tarajal beach Saturday morning were met by soldiers who escorted them across the border. Most of the 50,000 to 60,000 migrants who entered the territory between Thursday and Friday soon went back.

“We are relentless against those who break the law,” Spanish Interior Minister Fernando Grande-Marlaska told journalists Saturday.