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The campaign group's report - "We cannot live here any more": Refugees from Syria in Egypt - says this change in atmosphere has prompted some Syrians to try to reach Europe by boat.
Many of those detained had been stopped whilst trying to make the hazardous crossing across the Mediterranean Sea.
The report says the Egyptian navy has intercepted around 13 boats since August and, according to UN refugee agency, arrested 946 people, 724 of whom remain in detention.
