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BEIRUT — The mother of American reporter Austin Tice, who has been missing in Syria for more than three years, believes her son is alive and well and urged Washington and Damascus to work together to free him.

Tice went missing in Damascus in 2012 and the U.S. State Department said in March that Washington had been in periodic, direct contact with the Syrian government regarding his case — a statement his mother said provided a glimmer of hope.

"We ask both governments to work together and to work effectively to locate Austin and to secure his safe release," Debra Tice told Reuters in Beirut on Tuesday during a trip to mark more than 1,000 days since he disappeared.

She said the family had received information from unspecified sources about her son's condition several weeks ago.

"We hear that he is well, that he is safe, which is of course very important, and the most important thing is for us to stay patient."

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Debra, the mother of American reporter Austin Tice who has been missing in Syria for more than three years, speaks during a news conference at the Press Club in Beirut May 19, 2015. Debra believes her son is alive and well and urged Washington and Damascus to work together to free him. AZIZ TAHER / Reuters

Tice had worked for publications including McClatchy Newspapers and The Washington Post. His family says it is unclear who is holding him.

Reporters Without Borders Secretary-General Christophe Deloire said Tice was not being detained by "religious extremist groups" and his mother told reporters he was not being held by "any part of the opposition."

"We do not know where he is nor who is holding him," she said. "Someone, someone possibly near this place, knows something about my son and his whereabouts."

She said the U.S. government had not offered her family enough support and that there had been too long a delay in establishing contact with Damascus.

"I grossly overestimated that those that I believed would be qualified in my government would step up to help my family."

The United States vowed last week to "work tirelessly" to bring Tice home.

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— Reuters