An Italian prosecutor is accusing some charities saving migrants in the Mediterranean Sea of colluding with people smugglers. Carmelo Zuccaro says that phone calls were made from Libya to rescue boats, and rescuers were shining lamps to direct smugglers' vessels. But migrant rescue organizations have rejected the accusations and said their only concern is saving lives. Italy is the main route for migrants trying to reach Europe, and nearly 1,000 people are believed to have drowned attempting to cross from Libya to Italy this year, according to the UN refugee agency.