Taher Mokhtar, a member of the Alexandria doctors' syndicate, said the 35 refugees he visited in a police station in the Mediterranean city demanded to be released or to be granted asylum in Europe.
The group, which came to Egypt to flee Syria's civil war, started their hunger strike Friday, Mokhtar said. They are part of a group of 52 refugees, including a dozen children, who have been held in the police station since September, he said.
Among those on strike are a pregnant woman and a 58-year-old man with back problems, already weakened by the lack of food, he said.
Syrian refugees who fled the civil war often complain of difficult conditions in Egypt, in part because some were accused of supporting Islamist President Mohammed Morsi, ousted by the military in July. Many Palestinian refugees in Syria also have fled the war to become refugees afresh.
Egyptian authorities imposed travel restrictions on Syrians in July, requiring them to obtain a visa and a security clearance prior to their arrival. Heated media campaigns also claim Syrian refugees participate in the protests calling for Morsi's reinstatement.
Egypt's interim authorities repeatedly have denied discriminating against Syrians, while right groups say Egypt unlawfully detains and deports them.
An official from the United Nations Refugee Agency in Egypt, Mohamed Dayri, said authorities currently detain 128 Syrian refugees in Egypt who tried to travel illegally to Europe through the Mediterranean Sea. Dayri said they usually are held until they buy a ticket to leave Egypt.
He said the strike appeared to be prompted by recent comments made by Sweden announcing they would resettle a limited number of Syrian refugees there.
"We have called upon Egyptian authorities to release them because they have been acquitted by prosecutors from any legal charges," Dayri said.
Syria's civil war started as a peaceful uprising against President Bashar Assad that deteriorated into all-out civil war after government forces violently cracked down on protesters. The UN said in July that 100,000 Syrians have been killed, while activists say more than 120,000 have been killed. Millions of Syrians have been uprooted from their homes because of the fighting, seeking refuge in neighboring countries.
The website of the UN Refugee Agency quotes Egyptian government figures saying there are some 300,000 Syrians in Egypt. The UNHCR has registered more than 127,000.
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