"The boat had sunk and they were spread out in the sea, they were trying to swim towards the coast," he said. "There were about 60 people who we were able to save because they were clinging to the (remains of the) boat." Another 140 migrants were picked up from the second boat, he said. Libya is the main departure point for mostly African migrants trying to cross to Europe. The International Organization for Migration said on Friday that since 2000 the Mediterranean had been "by far the world's deadliest border" for migrants.