The sources say that the migrants, helped by mafia-linked people traffickers who promise them that Spain is a "paradise", have come through the southern border of Morocco and an increasing number are gathering in the north of the country, Spanish newspaper El Mundo reports.
Migrants, intercepted aboard dinghies off the coast in the Strait of Gibraltar, are stopped by a Spanish Civil Guard as they are led into police buses as they leave the port of Algeciras, southern Spain, August 1, 2018.
Close to 21,000 migrants have arrived in Spain by sea since the beginning of the year and 304 died in the attempt, the International Organization for Migration says.
"It isn't possible to give legal papers to everyone, nor is it for Spain to absorb the millions of Africans who come looking for a better future in Europe", said Casado at a party event in Ávila on July 29.
The EU has said it will be sending over €55 million to Spain, to assist in the surge in migrants ...
During a fact-finding visit to Algeciras on Saturday, interior minister Fernando Grande-Marlaska denied there was a "collapse" in the system to receive migrants, saying the situation is "absolutely under control and controllable".
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Emergency shelters have been set up in the harbour, as well as a police station, but many rescued migrants have been forced to sleep in an orange rescue boat dock in the port, or on the ground beside it.
"The number of migrant arrivals is very significant, as is the lack of means to deal with it", the representative of the Cadiz branch of the United Police Union (SUP), Carmen Velayos, told AFP.
In some cases officials have asked local residents to donate water and basic food items for them, she added.
The Libya-Italy Mediterranean route, which was the main one until recently, has dwindled by 80 percent while Spain has now become the main destination for migrants trying to reach Europe. It accuses the previous PP administration of not preparing for a predictable rise in migrant arrivals.
Borrell, a member of the Socialist Party said: "We're talking about 20,000 (migrants) so far this year for a country of more than 40 million inhabitants".