Scores of Egyptian Islamists protested Friday outside the US embassy in Cairo against the continuing imprisonment of militant Muslim cleric Omar Abdel-Rahman, DPA reported.
They vowed not to stop their "open-ended" protest until they got an official promise from US authorities to release Abdel-Rahman.
"We will not end our sit-in until my father is freed or we get an official letter from the US that he will be released," Ibrahim, the son of the 74-year-old cleric, was quoted as saying by the website of official Egyptian radio and television.
He demanded the ruling military council in Egypt request the US to release him.
Abdel-Rahman is currently serving a life sentence in the United States after having been convicted of "seditious conspiracy" in connection with the World Trade Center 1993 bombings.
"Seditious conspiracy" requires only that a crime be planned.
Adel-Rahman's loyalists allege the US detained him to please former Egyptian president Hosny Mubarak who was a key ally of Washington.