NEW : ( CNN ) -- Pirates had held Greek ship and its load of iron for nearly a month . French navy tracked pirates overnight after they attacked a merchant ship . The captain was killed, but the crew managed to escape with their cargo. Pirates : Attack Tuesday on the Liberty Sun was a response to the killing of pirates .
NEW : Pirates had held Greek ship and its load of iron for nearly a month . French navy tracked pirates overnight after they attacked a merchant ship . The captain was killed, but the crew managed to escape with their cargo. Pirates : Attack Tuesday on the Liberty Sun was a response to the killing of pirates .