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The US administration expressed disappointment toward the life sentence handed to Mohamed Sultan, son of Muslim Brotherhood leader, by the Giza Criminal Court on Saturday.
Sultan who holds an American citizenship has been on hunger strike for over a year ago protesting his arrest.
"We remain deeply concerned about Mr. Sultan’s health and detention. The United States reiterates our call for the release of Mr. Sultan on humanitarian grounds, and we urge the government of Egypt to redress this verdict," said US State Department spokeswoman Marie Harf in a statement Saturday.
The Department of State takes its assistance to US citizens abroad very seriously. Embassy officials remain in contact with Sultan and will continue to provide all possible consular assistance, the statement added.
Edited translation from Anadolu Agency