Mohammed Ali Malek is seen at Catania's tribunal, on Friday. Italian prosecutors blamed the captain of a grossly overloaded fishing boat for a collision that capsized and sank his vessel off Libya, drowning hundreds of migrants. Antonio Parrinello/Reuters/Landov hide caption

itoggle caption Antonio Parrinello/Reuters/Landov

In this photo made available Thursday, April 23, 2015, migrants crowd and inflatable dinghy as the Italian Coast Guard approaches them, off the Libyan coast, on Wednesday. Alessandro Di Meo/AP hide caption

itoggle caption Alessandro Di Meo/AP

Chantel, 3, and Antoni, 7 months, migrated to Spain from their native Cameroon, with their mother Tatiana Kanga, 25. Tatiana was nine months pregnant with Antoni when they crossed the Mediterranean Sea together in an inflatable boat. Lauren Frayer/NPR hide caption

itoggle caption Lauren Frayer/NPR

The King Jacob, a Portuguese-flagged cargo vessel, was the first ship to arrive near the migrant boat that sank off the Libyan coast over the weekend. The boat had been carrying more than 800 people. Alessandro Fucarini/AP hide caption

itoggle caption Alessandro Fucarini/AP