Tehran, Iran (CNN) -- An Iranian-American man held on spying charges in Iran must be tried there, the spokesman for a key parliamentary committee said Wednesday, according to the semi-official Mehr news agency.
"The American spy is guilty and must be put on trial in Iran," said Kazem Jalali, a spokesman for Parliament's National Security and Foreign Policy Committee.
"American officials brazenly send spies and spy planes to our borders and then shamelessly declare that they must be returned to them," Mehr cites him as saying. "The U.S. request to free the American spy is politically impudent."
Amir Mirzaei Hekmati, a former U.S. Marine, was arrested in August while visiting his grandmother and other relatives, his family said. In a statement released Tuesday, they said they remained quiet about the arrest at the urging of Iranian officials, who promised his release.
U.S. State Department spokeswoman Victoria Nuland told reporters Tuesday that Hekmati is being falsely accused, but she had no further comment.
His family called a purported confession aired by Tehran "forced."
"Amir's family was shocked by the recent broadcast aired on Iranian TV with false information and a forced confession," they said. "Amir has never had any affiliation with the CIA, and these allegations are untrue.
"Amir's family hopes that this misunderstanding can be resolved peacefully with Iran, and that Amir can be reunited with his family and friends in the U.S. who miss him dearly, and are praying for his safe return," they said.
Iran's semi-official Fars news agency reported Sunday that Hekmati had received language training and became an intelligence analyst in the Marines. It aired video showing what it called his confession, in which he appeared calm and collected, sitting in a quiet, well-furnished room as he spoke.
But Fars did not broadcast his full statement, and it was not clear what questions he had been asked.
The Hekmatis said their son served in the Marines from 2001 to 2005. After that he started his own linguistics company and contracted his services to the military as well as civilian businesses.
His military contracts included cultural competency training. He worked with troops at military bases to promote understanding of and positive communication with people of other cultures, his family said.
The family said he went to Iran in August after obtaining permission from the Iranian Interests Section of the Pakistani Embassy in Washington. The United States and Iran have no direct diplomatic relations.
"The Iranian government detained Amir on August 29, 2011, without any charges, and urged our family to remain silent with the promise of an eventual release," the family said.