article_snippet.sent: Two of 28 people were arrested on suspicion of human trafficking upon arriving in Sicily, according to Italian police officer Maria Guia Federico.
article_snippet.sent: Smugglers -- human traffickers organizing the voyages -- had locked the doors to the lower levels of the vessel, one Bangladeshi survivor told Italian authorities.
highlights_snippet.sent: Two survivors were arrested on suspicion of human trafficking, police say .
  
highlights_snippet.sent: A survivor tells authorities that migrants were trapped behind locked doors .