At least 31 migrants are presumed to have died while attempting to cross the English Channel from France to Britain on Wednesday.

French Interior Minister Gérald Darmanin announced the dead included five women and a small girl, while two people survived. One person was still missing Wednesday night, as a search-and-rescue operation including several ships and helicopters continued.

“Today is a great national mourning for France, and for Europe, and humanity,” Darmanin said.

Both French and British officials directed the blame on human traffickers. Four suspects who might be related to the incident had been apprehended, Darmanin said.