[Barnett:] We have some dramatic images to show you. They underscore the often deadly dangers migrants face to flee to Europe. An Italian patrol boat approached an overcrowded migrant boat to offer life jackets and you see there the passengers rushed to one side. That caused the boat to rock violently before capsizing.
[Church:] The Italian crew threw life jackets to the people who spilled into the sea. The navy says more than 560 migrants were rescued but five people died. Nearly 6,000 migrants have been rescued recently.
[Barnett:] For a third day, Greek authorities are moving thousands of migrants from the border with Macedonia to state-run facilities. A Greek government spokesman says the train line to the Balkans which runs through the Idomeni migrant camp should be open in the coming days. Protesters at the camp have been blocking those tracks since late March.
[Church:] Well, the migrants face another risk besides the dangerous Mediterranean crossing.
[Barnett:] That's right. Nick Paton Walsh has this exclusive report from Tripoli on how ISIS militants are infiltrating migrant groups to get to Europe.
[Walsh:] This is the moment when desperate dreams come to an end. We're with the Libyan immigration police inside a warehouse of migrant hopefuls they just raided right on the Tripoli beachfront. As Turkey and Greece close their shores, the Libyan route to Europe has exploded again. Here, among the squalor that a lifetime's savings buys, is when fantasies of a future in Europe fall apart. Where are you from?
[Unidentified Male:] Nigeria.
[Walsh:] Bejim fled ISIS-loyal Boko Haram in Nigeria, whose bombs killed his father and brother. And he survived the desert trek until here. We leave quickly as this is the smugglers' neighborhood. But there is a new threat here. Smugglers and police telling us that ISIS have hidden fighters among other groups of migrants bound for Europe. This trade in human souls is awful enough until you think that perhaps ISIS are using this passage of human life into Europe to try to infiltrate the continent with sleeper cells. Police tell us off camera they've caught different other migrants with ISIS links and a top Libyan intelligence official warns us the threat is real. It is a huge and unpatronable coastline where smugglers rule. We talked to one disguised for his safety who says in the past two months ferrying ISIS has become part of the trade.
[Unidentified Male:] About two weeks ago, a boat left the ISIS stronghold serge. Among them were about 40 ISIS. They were heading to Europe but bad weather turned them back. Ten days later they tried again. I don't know if they got there. About a month ago, I got a call from a devout guy I knew was ISIS. He wanted a small boat for 25 people and was willing to pay about $40,000. I didn't take the deal.
[Walsh:] Do you and other smugglers feel comfortable moving people who you know may be ISIS toward Europe?
[Unidentified Male:] Smugglers are only interested in smuggling. ISIS, anyone. They don't care. Melon or watermelon. Only money matters.
[Walsh:] The Libyan state is torn apart by infighting. Its coast guard struggling to even find boats. Fighting the migrant trade across this, the whole coastline of the Libyan capital Tripoli, are just six boats like this, none of which are in particularly good service. You simply can't imagine how under resourced things are here so close to Europe. These are the desperate scenes as they try to rescue some African migrants whose dinghy collapsed late last year. Smugglers now prefer these dinghies, vulnerable to the slightest weather change. A trait born of human misery. Some fleeing ISIS themselves. Only to find ISIS now seek to hijack their deadly journey to spread more suffering. Nick Paton Walsh, CNN, Tripoli.
[Barnett:] You are watching CNN NEWSROOM. Still to come, a new report shows Hillary Clinton broke federal rules by using her own server for official e-mails. We'll ask our legal analyst whether that was criminal.
[Church:] Plus, one of Italy's most famous cities has quite a cleanup ahead after a road collapsed in a popular tourist spot. We'll explain when we come back.