The leaders of the rebel Free Syrian Army say they have moved their command center from Turkey to Syria.

Brig. Gen. Mustafa al-Sheikh, who heads the FSA's Military Council, told The Associated Press that the move aims to unite all rebel groups. He said Saturday that the move was made the week before, without specifying its new location.

FSA commander Col. Riad al-Asaad issued a video titled "Free Syrian Army Communique Number 1 from Inside" that the command has moved to "liberated areas."

The FSA has been the most prominent of the rebel groups trying to remove President Bashar Assad from power. But its commanders have come under criticism in the past for leading from Turkey, and its authority over numerous locally-based networks of fighters is limited.

Earlier in the day, eyewitness reports claimed that Syrian rebel fighters trying to oust President Bashar Assad shot down a fighter jet as it flew over the northern Syrian town of Atarib in Idlib province, a witness said.

The witness, an independent journalist who asked to remain anonymous, said rebel fighters were attacking a military base near the town when the jet flew over and rebels shot it down with anti-aircraft guns.

Vastly outgunned, rebels say they need surface-to-air missiles to take down planes and helicopters used by the Syrian military to bombard opposition strongholds.

Fighters use outdated anti-aircraft machine guns that are welded to pickup trucks but they are inaccurate and useless if the military aircraft fly above a certain altitude.