CEUTA, Spain (AP) — Spain deployed its military to the Moroccan border Tuesday as thousands of migrants jumped fences or swam onto European soil for the second day in a row after Rabat loosened border controls amid a deepening diplomatic spat.

Overwhelmed soldiers separated the adults from the young and carried children in their arms while Red Cross workers helped an endless trickle of migrants who were emerging from the water shivering and exhausted. One unconscious woman laid on the sand before she was carried away on a stretcher.

The sudden influx of migrants has fueled the diplomatic spat between Rabat and Madrid over the disputed Western Sahara region and created a humanitarian crisis for Ceuta, the Spanish city of 85,000 in North Africa on the Mediterranean Sea, separated from Morocco by a double-wide, 10-meter (32-feet) fence.

Video cameras captured how some people rushed up the hills surrounding the city and jumped over the double fence.

Spanish Prime Minister Pedro Sánchez canceled a trip to Paris, where he was to attend a summit on international aid to Africa, and announced an imminent visit to the southern city. While calling Morocco a “friend of Spain," Sánchez also urged authorities to “respect the shared border.”

By Tuesday morning, at least 6,000 sea-soaked people had crossed the border into Ceuta since early Monday, the Spanish government said, including 1,500 thought to be teenagers. The number getting in slowed but didn't stop Tuesday even as Spain deployed additional police and soldiers to the border.

Some 2,700 adults were already returned to Morocco, according to Spain's Interior Ministry. Morocco and Spain signed an agreement three decades ago to expel all those who swim across the border.

Yet many arriving Tuesday were sub-Saharan Africans who are usually fleeing poverty or violence back home. Spain has agreements to return some of those migrants to their native countries but not all.

By Tuesday afternoon, Moroccan authorities closed the road leading to the border post with Ceuta and anti-riot police dispersed crowds of would-be migrants. Neither the government in Rabat nor local officials have commented about the mass influx or responded to queries by The Associated Press.

“It’s such a strong invasion that we are not able to calculate the number of people that have entered,” said Juan Jesús Vivas, the president of Ceuta, an autonomous city of about 20 square kilometers (7.7 square miles).

“The army is at the border in a deterrent role, but there are great quantities of people on the Moroccan side waiting to enter,” he told Cadena SER radio.

One young man drowned and dozens were treated for hypothermia. The arriving adults were being transferred to Ceuta’s main soccer stadium as they waited to be returned to Morocco while those thought to be minors were sent to warehouses run by charity group.

Four Spanish armored vehicles parked Tuesday at Tarajal beach in Ceuta, where the border fence leads to a short breakwater.

In a video shared by a Spanish police union urging authorities to send in reinforcements, anti-riot officers behind the border fence were using shields to protect themselves from stones being thrown by people in Morocco.

Interior Minister Fernando Grande-Marlaska denied local media reports saying that unaccompanied Moroccan migrants under 18, who are allowed to remain legally under the tutelage of Spanish authorities, were being deported.

The European Union’s top migration official – Home Affairs Commissioner Ylva Johansson – described the incidents as “worrying” and called on Morocco to prevent people from setting out in the first place.

“The most important thing now is that Morocco continues to commit to prevent irregular departures, and that those who do not have the right to stay are orderly and effectively returned,” Johansson told the European Parliament.

“Spanish borders are European borders. The European Union wants to build a relationship with Morocco based on trust and shared commitments. Migration is a key element,” she said.

Morocco's loosened border watch came after Spain decided to grant entry for medical treatment to the chief of a militant group that fights Morocco for the independence of Western Sahara. Morocco annexed the sprawling region on the west coast of Africa in 1975.

Morocco’s Foreign Ministry has said Madrid’s move to assist Brahim Ghali, head of the Polisario Front, was “inconsistent with the spirit of partnership and good neighborliness” and vowed there would be “consequences.”

Vivas, Ceuta's conservative regional president, said residents were in a state of “anguish, concern and fear" and 60% of the city's children had not shown up for school on Tuesday. He also linked the sudden mass arrival to Spain's compassionate assistance to Ghali.

The Spanish government itself, however, officially rejects the notion that Morocco is punishing Spain for a humanitarian move.

“I cannot envisage that putting the lives of young people and minors at risk is in response to a humanitarian issue,” Foreign Minister Arancha González Laya said.

The prime minister appeared on live television to announce he would visit Ceuta and that his top priority was to ensure safety in the city “in the face of any challenge, any eventuality and under any circumstance.”

Over the decades, Spain has built a close relationship with Morocco to crack down on illegal border crossings but also to increase economic exchanges and fight extremism. Sánchez on Tuesday avoided any direct criticism to Rabat in his speech.

“To be effective,” he said, “that cooperation must always be based on respect — respect for the shared border.''

Sánchez was also facing a political storm at home, with the far-right Vox party blaming the migration crisis on the government's “inaction" and sending its leader on a quick visit to Ceuta.

Many African migrants regard Ceuta and nearby Melilla, another Spanish territory, as a gateway into Europe. In 2020, 2,228 chose to cross into the two enclaves by sea or land, often risking injuries or death.

On Tuesday, another 80 African migrants readed Melilla, 350 kilometers (218 miles) east of Ceuta, by jumping over the enclave’s double fence.

Morocco scored a diplomatic victory last year when the previous U.S. administration under Donald Trump recognized Rabat’s sovereignty over Western Sahara, paving the way for normalizing relations between Israel and Morocco.

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AP journalists Tarik El Barakah in Rabat, Lorne Cook in Brussels, and Elaine Ganley in Paris contributed to this report.

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Follow AP’s global migration coverage at https://apnews.com/hub/migration