More than 600 sailors from the naval group of France’s flagship aircraft carrier, Charles de Gaulle, have tested positive for coronavirus, the country’s Ministry of Armed Forces announced Wednesday.

According to the statement, 668 crew members have tested positive for Covid-19.

A total of 1,767 sailors from the Charles de Gaulle and its escort vessels were tested. The majority of those tested were onboard the flagship aircraft carrier.

Some 31 crew members are hospitalized at the St. Anne military hospital in Toulon, France, and one crew-member is receiving treatment in intensive care.

Both the Charles de Gaulle, and its accompanying warship, Chevalier Paul, arrived in Toulon on Sunday, after an initial 50 cases were confirmed onboard.