TEHRAN — A reporter for The Washington Post who has been jailed since July was finally charged by the Iranian authorities in a 10-hour court session on Saturday, his family confirmed on Sunday, but he was not told what he was being charged with.

The court appearance of the reporter, Jason Rezaian, was also confirmed by his lawyer, Saleh Nikbakht, who has not been allowed to defend Mr. Rezaian. Beyond that, Mr. Nikbakht said in a phone interview, “I don’t know what happened.”

People close to Mr. Rezaian, including his wife, Yeganeh Salehi, who was herself arrested and then released in October, have refused to talk to the news media. But the family of Mr. Rezaian, who holds both American and Iranian citizenship, released a statement Sunday saying that charges had been filed and asking Iran’s supreme leader, Ayatollah Ali Khamenei, to release him. “In its ongoing disregard of Iran’s own laws,” the statement read, “the Iranian judiciary has continued to deny Jason access to legal representation, denied his request for bail and prevented access to review of his case file.

“This continued disrespect for Iran’s judicial system should be a concern not only to the international community who are eagerly awaiting normalization of relations with Iran, but also to all those Iranians who claim that Iran is a country of laws which should be recognized as such by major world powers.”