The latest developments on Europe's migration crisis (all times local):

4 p.m.

Spain's defense ministry says a Spanish navy vessel has arrested two men suspected of being human smugglers in waters near the Libyan coast.

The defense ministry says two Libyans were arrested during an operation by the Spanish frigate "Reina Sofia" to rescue 362 migrants attempting to cross the Mediterranean Sea. The warship turned the two over to Italian authorities, who jailed them on charges of human trafficking.

A third man from Senegal was also arrested and charged by Italian officials of aiding illegal immigration, according to the ministry.

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2:30 p.m.

Around a 100 asylum-seekers are braving the scorching heat to march toward Serbia's border with Hungary, trying to draw attention to the plight of thousands of people facing closed borders after fleeing war and poverty.

Some wore towels on their heads to ward off the sun Saturday as they slowly moved, stopping occasionally to rest in the shade along the road leading north toward the European Union. Their feet bruised from walking, dozens have given up and stayed behind.

Some 300 young men and boys set off Friday from Belgrade toward the Hungarian border, 200 kilometers (120 miles) away, to protest its decision to keep the border closed for most of the asylum-seekers, which has left a few thousand stranded in Serbia.

Hungary has recently strengthened anti-migrant controls on its southern border with Serbia, admitting about 30 people a day, mostly families with small children, and pushing back those caught trying to cross illegally. Hundreds of migrants have been staying in makeshift camps along the border with almost no facilities.