Italian rescue ships brought migrants by the thousands to the country's southern ports, including a baby born aboard a navy vessel, as crowded shelters in Sicily and on the mainland struggled on Monday to find room for them.

Some politicians based in northern Italy, meanwhile, vowed their regions wouldn't take in any of the rescued migrants.

In a three-day period ending Sunday, 6,771 survivors were rescued at sea north of Libya from overcrowded rubber dinghies and unseaworthy fishing boats used by smugglers, according to Coast Guard numbers Monday. Ten bodies were found Sunday on boats or in the sea.

Calm seas and mild temperatures brought the spike in arrivals. The relentless stream of migrants this year is on track to surpass the 170,000 rescued at sea by Italy in 2014.

The navy said a woman, in labor when rescued Sunday, gave birth to a girl aboard one of its patrol ships. Mother and daughter are fine, and the patrol boat, carrying 654 migrants who were saved in four different rescue operations, headed to port.

Other rescuers had grim tasks. An Italian tugboat, among several commercial vessels saving migrants Sunday, also recovered two corpses, the Navy said.

This wave of arrivals set port town mayors and charity organizations scrambling to find beds for the migrants. Many migrants, from Africa, will seek asylum because of war or persecution, and hope to reach relatives in northern Europe. Until applications are processed, which could take months or longer, asylum-seekers are supposed to stay in Italy.

In Reggio Calabria, where 780 migrants disembarked in the "toe" of the Italian peninsula, priority was being accorded to families, to keep them together locally. Around 540 of the arrivals were going to be taken to the Tuscany or Emilia Romagna regions in the north.

The Milan-based governor of Lombardy vowed not to take any more migrants.

"In a few days I will be in Rome and I'll repeat to the interior minister that Lombardy has already done its part," Gov. Roberto Maroni was quoted by the Italian news agency ANSA as saying. "If there is any funding available, it should be spent on our citizens and not for clandestine" migrants.

An estimated 800 migrants drowned last month when their boat capsized off Libya with hundreds of them locked in the hold by smugglers. After that, the European Union held an emergency summit and agreed to contribute more boats and patrol aircraft to rescue efforts.