ATHENS, Greece — Greece is pressing ahead with plans to start deporting migrants and refugees back to Turkey next week, despite mounting concern from the United Nations and human rights organizations that Syrians could be denied proper protection while some are allegedly even being forced back into their war-torn country. Lawmakers in Athens Friday voted 169-107 to back draft legislation, fast-tracked through parliament, to allow the returns to start as soon as Monday. The operation would see migrants and refugees who arrived on Greek islands after March 20 put on boats and sent back to Turkey. Several Greek officials with knowledge of the planning told the AP that deportations are likely to start from the island of Lesbos, with migrants from Afghanistan, Pakistan and other countries whose asylum claims are considered inadmissible. The transport, the officials said, will be carried out under heavy security escort — with one police minder for every migrant — using buses that will travel from island detention camps and are likely to board straight onto chartered vessels. The officials asked not to be identified because plans for the forced returns have not been formally announced. The imminent deportations are backed by the European Union following its recent agreement with Turkey, and triggered more violence at detention camps in Greece. Authorities on the Greek island of Chios said several hundred people pushed their way out of an overcrowded detention camp and staged a peaceful protest in the island’s main town, chanting “freedom, freedom” and “Turkey no.” The rally followed overnight clashes between Syrian and Afghan detainees that left five people injured. More protests are planned on the island today. In Geneva, Switzerland, the United Nations refugee agency, or UNHCR, urged Greece and Turkey to provide further safeguards for asylum seekers before the returns begin, noting that conditions were worsening by the day for more than 4,000 people being held in detention on Greek islands. And rights group Amnesty International, which has strongly opposed the EU-Turkey agreement from the start, said in a report Friday that it had evidence of Turkish authorities rounding up Syrians and sending them back across the border to their conflict-torn country. The group said Turkey has been expelling around 100 men, women and children nearly daily since mid-January. “EU leaders have willfully ignored the simplest of facts: Turkey is not a safe country for Syrian refugees,” Amnesty’s Europe and Central Asia Director John Dalhuisen said. Greek officials did not respond to the criticism directly, but insisted the rights of detained asylum seekers were being protected. “I assure you that we will strictly observe human rights procedures, not what people are inventing, but what is required under the circumstances,” Migration Affairs Minister Ioannis Mouzalas told parliament. The clashes on Chios were the latest in a series of violent incidents at shelters and gathering points across Greece, where more than 52,000 migrants and refugees are stranded following EU-supported Balkan border closures. More than 11,000 of those stranded remain camped out at the Greek-Macedonian border, ignoring calls by the government to move voluntarily to organized shelters. Many say they have heard conditions in other camps are worse, and they fear what they might find if they are forced to move. Karzan Kmaran, a 28-year-old Iraqi from near the city of Mosul, said he still hoped that the borders would open. “We are waiting for hope.