Only a few dozen people were saved Sunday after a fishing boat smuggling hundreds of migrants from Libya to Europe overturned in what could become one of the Mediterranean's deadliest mass drownings. "How can it be that we daily are witnessing a tragedy?" asked Italian Premier Matteo Renzi, who huddled with his top ministers in an emergency strategy session in Rome. Resisting rising political calls for military intervention, Renzi ruled out any naval blockade off Libya's coast. He said that would only "wind up helping the smugglers" since military ships would be there to rescue any migrants, and because the chaos in Libya would make it impossible to force the passengers back to shore.