Hundreds of migrants tried to force their way past tightened security into Ceuta on Wednesday, as Spain pressed on with the expulsion of thousands who had swum or climbed into its North African enclave over the past two days. Around two-thirds of the roughly 8,000 migrants who made it to Ceuta, including unaccompanied children, have been expelled, Spanish authorities say, though many of those returned said they would again try to reach Europe. As thousands gathered in the Moroccan border town of Fnideq, near the frontier with Ceuta, hundreds of them clashed after dark with Moroccan riot police, throwing stones and setting on fire a motorbike and a rubbish bin, a Reuters witness said. The rush of migrants began on Monday when Morocco appeared to loosen border controls, a move widely interpreted as retaliation for Spain"s hosting of a Western Sahara independence leader. read more As dense afternoon fog descended on Wednesday, hundreds of young men tried to approach the six-metre-high (20-foot-high) border fence before being repelled by Moroccan police, who later urged the crowd to disperse. Others had entered the water and begun swimming towards Ceuta"s beach a few hundred metres (yards) away. Spanish television showed the army meeting boys as they reached the shore. Some 1,500 underage migrants are now in reception centres in Ceuta from this and previous waves, Spain said. On the northern tip of Morocco across from Gibraltar and with a population of 80,000, the enclave has periodically been a magnet for refugees seeking a quick way into Europe. But Rabat has cracked down on border traffic in recent years. "JUICE AND A CAKE" "I am not losing hope. I have friends in Ceuta where I can stay till I get a chance to cross to Spain," Souhail Abbadi, a man in his 20s from Tangier in northwest Morocco, told Reuters. Earlier, Spanish police and soldiers escorted long lines of Moroccans and other mainly sub-Saharan Africans through a gate back into Morocco. "We were given juice and a cake, that is all," said Mohamed, from Ait Melloul in southwest Morocco, after Spanish soldiers sent him back as soon as he arrived. He and many other returnees gathered in Fnideq, where they said they were receiving no aid. A Spanish soldier stands next to migrants who rest after crossing the Spanish-Moroccan border, after thousands of migrants swam across the border, in Ceuta, Spain, May 19, 2021. REUTERS/Jon Nazca Spanish soldiers help Moroccan citizens at El Tarajal beach, near the fence between the Spanish-Moroccan border, after thousands of migrants swam across the border, in Ceuta, Spain, May 19, 2021. REUTERS/Jon Nazca Spanish soldiers stand guard as Moroccan citizens sit at El Tarajal beach, near the fence between the Spanish-Moroccan border, after thousands of migrants swam across the border, in Ceuta, Spain, May 19, 2021. REUTERS/Jon Nazca 1/7 Spanish soldiers help Moroccan citizens at El Tarajal beach, near the fence between the Spanish-Moroccan border, after thousands of migrants swam across the border, in Ceuta, Spain, May 19, 2021. REUTERS/Jon Nazca Rights group Amnesty International said Spanish security forces had used violence, including beating migrants or throwing them into the sea. It also accused Morocco of using migrants as pawns in its dispute with Spain. Migrants interviewed by Reuters said they had been beaten by Spanish security forces before being sent back to Morocco. A Reuters journalist watching the arrivals in Ceuta on Wednesday did not see any beatings or people being thrown into the sea. Many of the migrants still in Ceuta were children, some as young as seven and some without families, said Spain"s Social Rights Minister Ione Belarre. read more "Many of them did not know the consequences of crossing the border. And many of them want to go back," she told broadcaster TVE. Reuters TV footage showed hundreds of teenagers being processed at a warehouse where Red Cross officials gave out food and drink. "WHAT DID SPAIN EXPECT?" Morocco"s minister of state for human rights, El Mustapha Ramid, suggested late on Tuesday that Rabat was justified in relaxing border controls after Polisario Front rebel leader Brahim Ghali entered Spain. read more "What did Spain expect from Morocco, which sees its neighbour hosting the head of a group that took up arms against the kingdom?" he wrote in a Facebook post. Madrid said it had made a humanitarian decision to allow in Ghali, whose movement seeks independence for Moroccan-run Western Sahara. read more In a further twist, Spain"s high court summoned Ghali to appear on June 1 for a preliminary hearing in a war crimes case against him, but he declined to sign the papers, a court document seen by Reuters on Wednesday showed. A source close to the investigation said he might seek diplomatic immunity under an Algerian passport. read more Spanish Prime Minister Pedro Sanchez did not link events in Ceuta to Ghali"s situation, calling Morocco a friend of Spain, though Rabat recalled its ambassador to Madrid for consultations. Moroccan authorities did not respond to requests for comment.