At least 31 migrants bound for Britain died Wednesday when their boat sank in the English Channel, in what France’s interior minister called the biggest migration tragedy on the dangerous crossing to date.

Axar.az reports that Interior Minister Gerald Darmanin said 34 people were believed to have been on the boat. Authorities found 31 bodies — including those of five women and a young girl — and two survivors, he said. One person appeared to still be missing. The nationalities of the travellers were not immediately known.

The regional maritime authority, which oversees rescue operations, later said 27 bodies were found, two people survived and four others were missing and presumed drowned. The discrepancy in the numbers was not immediately explained.