Spain’s foreign minister, Arancha González Laya, said in a radio interview on Monday that Mr. Ghali’s hospitalization was a humanitarian response to “a person who was in a very, very fragile health situation.”

She added that Moroccan officials had told their Spanish counterparts that the sudden rise in migrant crossings was not the result of a disagreement over the hospitalization.

Estrella Galán, the director general of CEAR, a Spanish group that helps asylum seekers and refugees, said Morocco was using migration as leverage against Spain.

But she added that Morocco’s move was the consequence of the European Union’s decision after the refugee crisis of 2015 to rely on greater control of migration by countries outside the bloc.

“This is what happens when we convert other countries into gendarmes of our own borders,” Ms. Galán said.

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